CN115096922A - ray scanning equipment - Google Patents

Abstract

The present application relates to a ray scanning device, which includes a conveying device that transports a detected object through a scanning area of the ray scanning device; a ray source, which includes a plurality of ray source modules, and each ray source module includes at least one ray source point, Viewed along the conveying direction of the detected object, a plurality of radiation source modules are arranged around the scanning area in a non-closed structure opened at one side of the scanning area; and a detector for detecting the radiation transmitted through the detected object during scanning and including A plurality of detector groups, the ends of the plurality of detector groups are connected to each other and are arranged around the scanning area in a non-closed structure opened on one side of the scanning area, the opening of the non-closed structure of the radiation source and the non-closed structure of the detector are The openings are arranged opposite to each other, multiple detector groups of the detector are fixed in the same plane perpendicular to the conveying direction of the detected object, and multiple ray source modules of the radiation source are arranged in multiple different planes perpendicular to the conveying direction of the detected object Inside.

Description

ray scanning equipment

technical field

The present application relates to the field of radiation imaging, in particular to a ray scanning device.

Background technique

Existing static CT (electronic computed tomography) (distributed multi-point source) or multi-view (single-point source) security inspection equipment usually arranges multiple different viewing angles in different directions perpendicular or inclined to the conveying direction of the detected object. In-plane, or concentrate all ray sources in a single annular or rectangular closed cavity. Most of the crystals of the detector array are perpendicular to the center plane of the ray beam of the ray source, and the same group of detector arrays only corresponds to a group of distributed multi-point sources or a single point source.

There is also a static CT with a double-ring structure design in the prior art, which simulates the working principle of a slip-ring CT, and arranges the radiation source and the detector on two different rings. The conveying direction of the inspection object is separated by a certain distance.

SUMMARY OF THE INVENTION

The above-mentioned static CT (distributed multi-point source) or multi-view (single-point source) equipment usually includes a plurality of planar light paths, and the plurality of plane light paths are arranged along the length direction of the equipment (ie, the conveying direction of the detected object). This arrangement results in a long optical path coverage of the static CT (distributed multi-point source) or multi-view (single-point source) equipment, which is not conducive to shortening the length of the whole machine and reducing the weight of the whole machine.

In addition, in the equipment arranged as described above, a group of detector arrays only corresponds to a group of distributed multi-point sources or a single point source, thereby increasing the number of detector arrays in the whole machine, which is not conducive to reducing the equipment cost of the whole machine.

In addition, in a device arranged as described above, concentrating all radiation sources in a single annular or rectangular closed cavity would increase the complexity of the device and reduce the reliability of the device, especially for devices that need to maintain a high degree of vacuum Even more so; in addition, the maintainability of the ray source is also poor.

In addition, in the static CT with the double-ring structure design as described above, although the arrangement of the radiation source ring and the detector ring can ensure that a single detector is shared by multiple radiation sources, it still does not solve the problem of concentrating the radiation sources in the Problems with poor reliability and maintainability caused by a single annular closed cavity. At the same time, if the distance between the ray source ring and the detector ring is too close, the detector can only be replaced or maintained from the inside of the ring, and the maintainability of the detector is also poor. If the distance between the source ring and the detector ring is large enough to enable the detector to be replaced or maintained from the outside of the ring, this arrangement will increase the coverage of the optical path, resulting in an increase in the length of the equipment, while the center of the ray beam There is an inclination angle with the detector crystal surface, and the ray beam obliquely strikes the detector crystal, which affects the image quality.

In order to solve the above problems, the embodiments of the present application provide a ray scanning device, which can solve the problems of poor reliability and maintenance caused by the concentration of multiple ray sources in a single annular closed cavity. The device group can be shared by multiple ray source modules, thereby reducing equipment costs. In addition, the detector can be easily replaced or maintained while the coverage of the optical path is shortened as much as possible, and at the same time, the center of the beam and the detector can be reduced. The inclination between the surfaces improves image quality.

Embodiments of the present application also provide a ray scanning device, which includes: a conveying device, which transports a detected object through a scanning area of the ray scanning device; a ray source, which includes a plurality of ray source modules, each ray source The module includes at least one radiation source point that emits a radiation beam, the plurality of radiation source modules are arranged around the scanning area above the conveying device, and are fixed in a plane perpendicular to the conveying direction of the detected object; and a detector for detecting rays transmitted through the detected object during scanning and comprising a plurality of detector groups, the ends of the plurality of detector groups being connected to each other to be arranged around the scanning area, and the A plurality of detector groups are fixed in a plane perpendicular to the conveying direction of the detected object, wherein the detectors are located between the radiation source and the scanning area along the vertical direction of the conveying direction of the detected object. Meanwhile, the radiation source and the detector are arranged to at least partially overlap along the conveying direction of the detected object, and the plurality of radiation source modules can be disassembled and installed independently of each other.

In the radiation scanning apparatus according to this embodiment, the radiation source modules are arranged around the scanning area only above the conveying device, the radiation source modules are not arranged below the conveying device, and the detectors are arranged around the scanning area, such a radiation scanning apparatus can lower the conveying device It is convenient to transfer the detected object to the transmission device of the radiation scanning equipment, and can reduce the manufacturing cost while ensuring the image quality.

According to some embodiments, the ray source modules are distributed multi-point sources, and the plurality of ray source modules form a non-closed structure with an opening under the conveying device surrounding the scanning area.

According to some embodiments, each of the plurality of ray source modules is a linear distributed multi-point source, and the plurality of linear distributed multi-point sources are arranged on the upper side, the left side and the right side of the scanning area, wherein the multiple The ends of a linear distributed multipoint source are directly connected or arranged at intervals.

According to some embodiments, the plurality of ray source modules include a plurality of first distributed multipoint sources and a plurality of second distributed multipoint sources, the plurality of first distributed multipoint sources and the plurality of first distributed multipoint sources The two distributed multi-point sources are alternately arranged, and the ends are directly connected or arranged at intervals.

According to some embodiments, the first distributed multipoint source is a linear distributed multipoint source, and the second distributed multipoint source is a linear distributed multipoint source with a length shorter than that of the first distributed multipoint source source or arc distributed multipoint source.

According to some embodiments, each of the plurality of ray source modules is a single point source group, and the plurality of single point source groups are arranged at least on the left side view, right side view, top view and corner oblique view above the conveying device , and each single point source group includes at least two single point sources.

According to some embodiments, each radiation source module has a separate cavity for accommodating a respective radiation generating device.

According to some embodiments, the individual cavity of each radiation source module is provided with a mounting and positioning structure, and the mounting and positioning structure is used for mounting and positioning the radiation source module and for rotating the radiation source module to adjust the radiation The beam exit angle.

According to some embodiments, each detector group is a detector array comprising a plurality of detector cells arranged in a closed square, rectangular, polygonal or elliptical shape surrounding the scanning area structure.

According to some embodiments, each detector group is a linear detector array, and the detector includes four linear detector arrays, and the four linear detector arrays are arranged on the upper, lower, left, right, and four sides of the scanning area, forming a rectangle or square structure.

According to some embodiments, each detector group is a linear detector array, the detectors including a plurality of first linear detector arrays and a plurality of second linear detector arrays, the second linear detector arrays being larger than all of the The first linear detector array is short, and the first linear detector array and the second linear detector array are alternately arranged around the scanning area to form a polygonal structure.

According to some embodiments, the detector groups of the detectors are detachable and installable independently of each other.

According to some embodiments, the respective detector groups of the detectors are configured to move in the conveying direction of the detected objects for disassembly and installation.

According to some embodiments, each detector group of the detector is configured such that a part of the detector group moves along the conveying direction of the detected object for disassembly and installation, and the other part of the detector group moves along the conveying direction of the detected object. Move vertically to remove and install.

According to some embodiments, each detector group of the detectors includes a detector arm, the radiation scanning device includes a support frame fixed relative to a mounting platform of the radiation scanning device, the detector groups via the detectors The arm is moved in a conveying direction of the detected object or a direction perpendicular to the conveying direction of the detected object to be attached to or detached from the support frame.

According to some embodiments, each detector group of the detector is configured to avoid the ray beam of the ipsilateral ray source module and receive the rays of all the remaining side ray source modules except the ipsilateral ray source module.

According to some embodiments, each detector unit of the detector group comprises a detector crystal for receiving radiation transmitted through the detected object during scanning, the detector crystal being arranged in the detector unit The end along the conveying direction of the detected object is arranged to be close to the edge of the ray beam of the ray source module on the same side in the conveying direction of the detected object, but does not block the ray beam.

According to some embodiments, the individual radiation source modules of the radiation source are arranged such that the radiation beam avoids the detector group on the same side and illuminates the detector crystals of the detector group on the opposite side.

According to some embodiments, each radiation source module is configured to rotate about the target axis so that the center position of the radiation beam illuminates the detector crystals of the detector groups on the opposite side.

According to some embodiments, the ray scanning apparatus further includes an image processing module configured to perform data compensation and/or reconstructed image restoration for missing projection data at the end of the ray source module to obtain a complete reconstructed image .

According to some embodiments, the image processing module is configured to perform image reconstruction by an iterative method, an image threshold inpainting method, or a combination of both.

Embodiments of the present application also provide a ray scanning device, which includes: a conveying device, which transports a detected object through a scanning area of the ray scanning device; a ray source, which includes a plurality of ray source modules, each ray source The module includes at least one ray source point that emits a ray beam, the plurality of ray source modules are arranged around the scanning area in a non-closed structure opened on the left or right side of the scanning area, and are fixed perpendicular to the detected area. in the plane of the conveying direction of the object; and a detector for detecting radiation transmitted through the detected object during scanning and comprising a plurality of detector groups, the ends of which are connected to each other to surround The scanning area is arranged, and the plurality of detector groups are fixed in a plane perpendicular to the conveying direction of the detected object, wherein the detectors are located in the vertical direction along the conveying direction of the detected object. Between the radiation source and the scanning area, the radiation source and the detector are arranged to at least partially overlap along the conveying direction of the detected object, and the plurality of radiation source modules can be disassembled and installed independently of each other .

In the radiation scanning apparatus according to the present embodiment, the radiation source modules are arranged around the scanning area on the upper side, the lower side, and the left or right side of the scanning area, and the detectors are arranged around the scanning area. Such a radiation scanning apparatus is suitable for detecting Airport hand luggage, taking advantage of the characteristics of large width and small thickness, and considering the influence of self-occlusion and ray attenuation of luggage items on projection data, can reduce manufacturing costs while ensuring high image quality.

According to some embodiments, the ray source modules are distributed multi-point sources, and the plurality of ray source modules surround the scanning area to form a non-closed structure opened on the left or right side of the scanning area.

According to some embodiments, each of the multiple ray source modules is a linear distributed multi-point source, and the multiple linear distributed multi-point sources are respectively arranged on the upper side, the lower side, and the left or right side of the scanning area, A non-closed structure opened on the left or right side of the scanning area is formed, wherein the ends of the plurality of linear distributed multi-point sources are directly connected or arranged at intervals.

According to some embodiments, the plurality of ray source modules include a plurality of first distributed multipoint sources and a plurality of second distributed multipoint sources, the plurality of first distributed multipoint sources and the plurality of first distributed multipoint sources The two distributed multi-point sources are alternately arranged, and the ends are directly connected or arranged at intervals.

According to some embodiments, the first distributed multipoint source is a linear distributed multipoint source, and the second distributed multipoint source is a linear distributed multipoint source with a length shorter than that of the first distributed multipoint source source or arc distributed multipoint source.

According to some embodiments, each of the plurality of ray source modules is a single point source group, and the plurality of single point source groups are arranged at least in a top view, a bottom view, a left view, or a right view and at least part of the scanning area. Corner oblique view, and each single point source group includes at least two single point sources.

According to some embodiments, each radiation source module has a separate cavity for accommodating a respective radiation generating device.

According to some embodiments, the cavity of each radiation source module includes a separate vacuum cavity for accommodating multiple targets.

According to some embodiments, the spacing between the targets within each radiation source module is smaller than the spacing between the targets at the ends of adjacent radiation source modules.

According to some embodiments, the individual cavity of each radiation source module is provided with a mounting and positioning structure, and the mounting and positioning structure is used for mounting and positioning the radiation source module and for rotating the radiation source module to adjust the radiation The beam exit angle.

According to some embodiments, each detector group is a detector array comprising a plurality of detector cells arranged in a closed square, rectangular, polygonal or elliptical shape surrounding the scanning area structure.

According to some embodiments, each detector group is a linear detector array, and the detector includes four linear detector arrays, and the four linear detector arrays are arranged on the upper, lower, left, right, and four sides of the scanning area, forming a rectangle or square structure.

According to some embodiments, each detector group is a linear detector array, the detectors including a plurality of first linear detector arrays and a plurality of second linear detector arrays, the second linear detector arrays being larger than all of the The first linear detector array is short, and the plurality of first linear detector arrays and the plurality of second linear detector arrays are alternately arranged around the scanning area to form a polygonal structure.

According to some embodiments, the detector groups of the detectors are detachable and installable independently of each other.

According to some embodiments, the detector groups on the upper and lower sides of the scanning area and the opening of the radiation source structure are configured to move perpendicular to the conveying direction of the detected object for disassembly and installation, on the opposite side of the opening of the radiation source structure The detector group is configured to move along the conveying direction of the detected object for disassembly and installation.

According to some embodiments, each detector group of the detectors includes a detector arm, the radiation scanning device includes a support frame fixed relative to a mounting platform of the radiation scanning device, the detector groups via the detectors Arms are mounted to or detached from the support frame.

According to some embodiments, each detector group of the detector is configured to avoid the ray beam of the ipsilateral ray source module and receive the rays of all the remaining side ray source modules except the ipsilateral ray source module.

According to some embodiments, each detector unit of the detector group comprises a detector crystal for receiving radiation transmitted through the detected object during scanning, the detector crystal being arranged in the detector unit The end along the conveying direction of the detected object is arranged to be close to the edge of the ray beam of the ray source module on the same side in the conveying direction of the detected object, but does not block the ray beam.

According to some embodiments, the individual radiation source modules of the radiation source are arranged such that the radiation beam avoids the detector group on the same side and illuminates the detector crystals of the detector group on the opposite side.

According to some embodiments, each radiation source module is configured to rotate about the target axis such that the center position of the radiation beam illuminates the detector crystals of the detector groups on the opposite side.

According to some embodiments, the ray scanning apparatus further includes an image processing module configured to perform data compensation and/or reconstructed image restoration for missing projection data at the end of the ray source module to obtain a complete reconstructed image .

According to some embodiments, the image processing module is configured to perform image reconstruction by an iterative method, an image threshold inpainting method, or a combination of both.

Embodiments of the present application also provide a ray scanning device, which includes a conveying device, which transports a detected object through a scanning area of the ray scanning device; a ray source, which includes a plurality of ray source modules, each ray source module comprising at least one ray source point that emits a ray beam, and viewed along the conveying direction of the detected object, a plurality of ray source modules are arranged around the scanning area in a non-closed structure opened on one side of the scanning area; and a detector for Detects the rays transmitted through the detected object during scanning and includes a plurality of detector groups, viewed along the conveying direction of the detected object, the ends of the plurality of detector groups are connected to each other and open on one side of the scanning area. The non-closed structure is arranged around the scanning area, wherein the opening of the non-closed structure of the radiation source and the opening of the non-closed structure of the detector are arranged oppositely, and the plurality of detector groups of the detector are fixed in a direction perpendicular to the conveying direction of the detected object. In the same plane, and the multiple radiation source modules of the radiation source are arranged in multiple different planes perpendicular to the conveying direction of the detected object.

In the radiation scanning device according to this embodiment, both the radiation source and the detector surround the scanning area on only three sides, as opposed to surrounding the scanning area on four sides (which may be one or both of the radiation source and the detector) In this case, enough data can be obtained for image reconstruction, and the cost and weight of the equipment can also be reduced, so that a lightweight ray scanning equipment can be provided.

According to some embodiments, the radiation source module with the radiation source located on one side of the opening of the non-enclosed structure of the detector and the plurality of detector groups of the detector are fixed in a direction perpendicular to the conveying direction of the detected object. In the same plane, other radiation source modules of the radiation source are fixed in other planes perpendicular to the conveying direction of the detected object.

According to some embodiments, other radiation source modules of the radiation source are fixed in other same planes perpendicular to the conveying direction of the detected object.

According to some embodiments, the plurality of radiation source modules can be detached and installed independently of each other.

According to some embodiments, each of the plurality of ray source modules is a distributed multi-point source, and viewed along the conveying direction of the detected object, the plurality of distributed multi-point sources are respectively arranged on three sides of the scanning area, to form a non-closed structure opening around one side of the scanning area.

According to some embodiments, the distributed multi-point source is in the shape of a straight line, an arc, a polyline or any combination thereof, so that the ray source is on one side of the scanning area when viewed from the conveying direction of the detected object Open rectangular, rounded rectangular, polygonal or oval structures.

According to some embodiments, each of the plurality of ray source modules is a single point source group, and each single point source group includes at least two single point sources.

According to some embodiments, each radiation source module has a separate cavity for accommodating a respective radiation generating device.

According to some embodiments, the cavity of each radiation source module includes a separate vacuum cavity for accommodating multiple targets.

According to some embodiments, the spacing between the targets within each radiation source module is smaller than the spacing between the targets at the ends of adjacent radiation source modules.

According to some embodiments, the individual cavity of each radiation source module is provided with a mounting and positioning structure, and the mounting and positioning structure is used for mounting and positioning the radiation source module and for rotating the radiation source module to adjust the radiation The beam exit angle.

According to some embodiments, each detector group is a detector array comprising a plurality of detector cells, the detector array comprising a linear detector array, an arcuate detector array, or a combination of both.

According to some embodiments, each detector group is a linear detector array, and the detector includes three linear detector arrays, and the three linear detector arrays are respectively arranged on three sides of the scanning area, formed in the A rectangular or square structure with one side of the scanning area open.

According to some embodiments, each detector group is a linear detector array, the detectors including a plurality of first linear detector arrays and a plurality of second linear detector arrays, the second linear detector arrays being larger than all of the The first linear detector array is short, and the plurality of first linear detector arrays and the plurality of second linear detector arrays are alternately arranged around the scanning area to form an opening on one side of the scanning area. polygonal structure.

According to some embodiments, the detector groups of the detectors are detachable and installable independently of each other.

According to some embodiments, the detector group of the detector is configured to move perpendicularly or parallel to the conveying direction of the detected object for disassembly and installation.

According to some embodiments, each detector group of the detectors includes a detector arm, the radiation scanning device includes a support frame fixed relative to a mounting platform of the radiation scanning device, the detector groups via the detectors Arms are mounted to or detached from the support frame.

According to some embodiments, when viewed from the conveying direction of the detected object, the detector is arranged between the radiation source and the scanning area; and along the conveying direction of the detected object, the other radiation sources The module at least partially overlaps the set of detectors on the same side.

According to some embodiments, the detector group of the detector on the same side as the other ray source modules is configured to avoid the ray beam of the same side ray source module and receive all the remaining sides except the same side ray source module The rays of the ray source module.

According to some embodiments, each detector unit of the detector group comprises a detector crystal for receiving radiation transmitted through the detected object during scanning, and the detector crystal is arranged in the detector unit The end of the detected object along the conveying direction of the detected object, and the detector crystals of the detector group on the same side as the other radiation source modules are arranged so as to be adjacent to the detected object in the conveying direction The ray beam edge of the ipsilateral ray source module, but does not block the ray beam.

According to some embodiments, the other radiation source modules of the radiation source are arranged such that the radiation beam avoids the detector group on the same side and illuminates the detector crystals of the detector group on the opposite side.

According to some embodiments, the other radiation source modules are configured to rotate about the target axis so that the center position of the radiation beam illuminates the detector crystals of the detector groups on the opposite side.

According to some embodiments, the ray scanning apparatus further includes an image processing module configured to perform data compensation and/or reconstructed image restoration for missing projection data at the end of the ray source module to obtain complete reconstructed image.

According to some embodiments, the image processing module is configured to perform image reconstruction by an iterative method, an image threshold inpainting method, or a combination of both.

An embodiment of the present application provides an installation and positioning structure for a radiation source of a radiation scanning device, the radiation scanning device includes a radiation source and a fixed support frame, the installation and positioning structure includes a main body, and the main body can be fixedly connected to The radiation source and the support frame are such that the radiation source can be fixedly installed on the support frame through the main body, and the installation and positioning structure further comprises: a moving device, and the radiation source can pass through the moving device moved to a predetermined installation position on a first plane; a first positioning device for positioning the radiation source on the first plane; a lifting device for adjusting the radiation source along a first direction , wherein the first direction is perpendicular to the first plane; and a second positioning device is used to fix the position of the radiation source in the first direction.

With the installation and positioning structure according to the above embodiment, each ray source module of the ray source can be disassembled and installed independently, and the beam exit angle of the ray source module can also be adjusted.

According to some embodiments, the moving device includes rollers disposed at both ends of the radiation source along the length direction.

According to some embodiments, the first positioning device includes a first positioning pin and a first pin hole provided on the main body and the support frame corresponding to the first positioning pin.

According to some embodiments, the lifting devices are disposed at both ends of the radiation source along the length direction, wherein the lifting device at one end is formed as a liftable roller, and the lifting device at the other end is formed as a lifting jack wire.

According to some embodiments, the second positioning device is formed as a positioning pad placed on the main body after the radiation source is adjusted to a predetermined position along the first direction by the lifting device below.

According to some embodiments, the installation and positioning structure further includes: an adjustment device, which is used for rotating the radiation source along a predetermined axis to adjust the beam exit angle of the radiation source.

According to some embodiments, the radiation source is provided with a mounting shaft, the main body is provided with a corresponding shaft hole, and the main body is mounted on the mounting shaft of the radiation source through the shaft hole; the positioning and mounting structure further includes A positioning member and a fastener, the main body is positioned relative to the radiation source through the positioning member and the cooperation of the shaft hole and the installation shaft, and is fixedly connected to the radiation source through the fastener; The adjusting device includes a rotation driving device, which can drive the radiation source to rotate around the installation shaft when the positioning member and the fastener are released.

According to some embodiments, the rotation driving device includes an adjusting block fixed on the radiation source and a top wire provided on the main body and abutting against the adjusting block, and the top wire can be rotated to push all the The adjustment block moves to rotate the radiation source.

According to some embodiments, the positioning member includes a second positioning pin and a corresponding second pin hole formed on the main body and the radiation source, and the fastener includes a fixing bolt and is formed on the main body and the radiation source. the corresponding threaded holes on the radiation source.

According to some embodiments, a ray scanning device is also provided, which includes a ray source and a fixed support frame, the ray source is fixedly installed on the support frame via the installation and positioning structure described in any of the above embodiments.

According to some embodiments, the radiation scanning device rotates the radiation source through the installation and positioning structure to adjust the beam exit angle of the radiation source.

Embodiments of the present application also provide a mounting and fixing structure for a detector of a radiation scanning device, the radiation scanning device includes the detector and a fixed support frame, the detector includes one or more detectors The detector group, the detector group is fixedly installed on the support frame or disassembled from the support frame via the installation and fixing structure, the installation and fixing structure includes: a first installation part, which is fixedly arranged on the detector on the detector group; a second installation part, which is fixedly arranged on the support frame and can move linearly with the first installation part, the detector group is on the first installation part and the second installation part In a state of mutual cooperation, it can move to a predetermined installation position along the second installation part; and a fixing device is arranged on one side of the detector group along the width direction, and is used for installation relative to the support frame The reference plane fixes the detector group.

With the installation and fixing structure according to the above-mentioned embodiment, each detector group of the detector can be disassembled and installed independently, which can be disassembled and maintained without disassembling the ray source module under the condition of being arranged inside the ray source module, which improves the detection efficiency. The convenience of disassembly and maintenance of the unit.

According to some embodiments, the second mounting portion is further configured to support the detector group at the predetermined mounting position in a state of cooperation with the first mounting portion.

According to some embodiments, the first mounting portion includes a sliding block extending along a length direction of the detector group, and the second mounting portion includes a fixed guide rail matched with the sliding block.

According to some embodiments, the fixing device includes a fastener and a positioning member disposed on the supporting frame, and an end surface of the positioning member away from the supporting frame is formed as the installation reference surface for abutting against the supporting frame. On the surface of the one side of the detector group in the width direction, the fastener passes through the positioning member and fastens the detector group relative to the end surface of the positioning member.

According to some embodiments, the sliders are disposed on opposite sides of the detector group in the width direction, and have inward extensions extending from edges of the detector groups on the opposite sides in the width direction. ; the fixed guide rail includes extension portions extending outward on opposite sides in the width direction; in the state where the first mounting portion and the second mounting portion are matched, the inner extension portion of the slider is located at Above the extension portion of the fixed guide rail, the two are arranged in contact and overlapped, so as to suspend the detector group on the fixed guide rail.

According to some embodiments, the fixed rail supports the slider below the slider.

According to some embodiments, the first mounting portion is formed as a sliding groove extending along the width direction of the detector group, and the second mounting portion is formed as a sliding rod matched with the sliding groove.

According to some embodiments, an end of the sliding rod close to the support frame is formed with a convex portion, and a surface of the convex portion facing the detector group is formed as the installation reference surface for abutting against the detection the surface of the other side in the width direction of the device group.

According to some embodiments, the fixing device is provided at the other end of the sliding rod opposite to the convex portion, and is arranged to abut against both sides of the detector group in the width direction with the convex portion, respectively.

According to some embodiments, the fixing device includes a positioning sleeve and a fastener, the positioning sleeve is sleeved on the other end of the sliding rod and abuts against the one side of the detector along the width direction, And the fastener is used for fixing the positioning sleeve to the other end of the sliding rod.

According to some embodiments, the second mounting portion includes two sliding bars, the first mounting portion includes two sliding grooves formed at both ends of the detector group in the length direction, the two sliding bars The rods cooperate with the two sliding grooves respectively to hold the detector group at the predetermined installation position.

According to some embodiments, the first mounting portion is formed as a fixing block fixed on the one side of the detector group in the width direction, the fixing block having a direction toward the thickness direction of the detector group The second mounting portion is formed as a cantilever portion fixed on the support frame, an extension portion is provided on the end of the cantilever portion away from the support frame, and the extension portion can be connected with the support frame. The opening of the fixed block moves in a straight line to fit.

According to some embodiments, the fixing device includes a fixing member and a fastener provided on the supporting frame, and an end surface of the fixing member away from the supporting frame is formed as the installation reference surface for abutting against the supporting frame. the surface of the one side of the detector group in the width direction, and the fastener is used to fasten the detector group with respect to the end face of the fixing member.

According to some embodiments, in a state in which the first mounting portion is matched with the second mounting portion, the cantilever portion supports the detector group at the predetermined mounting position through the fixing block.

According to some embodiments, there is also provided a ray scanning device, which includes a detector and a fixedly arranged support frame, the detector includes one or more detector groups, and the detector group passes the method described in any of the above embodiments. The installation and fixing structure is installed and fixed on the support frame or removed from the support frame.

According to some embodiments, the width direction of the detector group is parallel to the conveying direction of the detected object, the length direction and the thickness direction of the detector group are perpendicular to the conveying direction of the detected object, and the conveying direction of the detected object is is the direction in which the detected object is conveyed through the scanning area of the radiation scanning device.

According to some embodiments, where the detector includes a plurality of detector groups, the mounting reference plane for each of the plurality of detector groups is located in the same plane perpendicular to the conveying direction of the detected object .

According to some embodiments, the direction in which the first mounting portion moves linearly relative to the second mounting portion is parallel or perpendicular to the conveying direction of the detected object.

Other features and technical advantages of the present application will become more apparent from the following detailed description with reference to the accompanying drawings and other embodiments.

Description of drawings

FIG. 1 is a schematic structural diagram of a radiation scanning device according to some embodiments of the present application;

FIG. 2 is a schematic diagram of a specific structure of a radiation source and a detector of the radiation scanning device shown in FIG. 1 according to some embodiments of the present application;

3 is a schematic diagram of a beam shape of a radiation source according to some embodiments of the present application;

4 is a schematic diagram of the distribution of radiation sources shown in the form of targets according to some embodiments of the present application;

5 is a schematic diagram of an installation and positioning structure of a ray source module according to some specific embodiments;

Figure 6 is a schematic diagram of the distribution of detectors according to some embodiments;

7 is a schematic structural diagram of a linear detector group according to some embodiments;

8 is a schematic structural diagram of a detector unit according to some embodiments;

FIG. 9 is a schematic diagram of the installation and fixing structure of the detector group according to some embodiments;

10 is a schematic diagram of the correspondence between a radiation source module and a detector group receiving its radiation according to some embodiments;

11 is a schematic cross-sectional structure diagram of the radiation scanning device shown in FIG. 1 along the center line of the conveying direction of the object to be detected, according to some embodiments;

12 is a schematic top view of the layout of detectors and radiation sources according to some embodiments;

Figure 13 is a schematic diagram of a combined detector and radiation source according to some embodiments;

FIG. 14 is a schematic diagram of the disassembly direction of the detector group in the combination of the detector and the radiation source shown in FIG. 13 according to some embodiments;

Figure 15 is a mounting fixture suitable for a detector group according to some embodiments;

Figure 16 is a mounting and fixing structure suitable for a detector group according to other embodiments;

FIG. 17 is a mounting and fixing structure suitable for a detector group according to further embodiments;

18 is a schematic diagram of the arrangement of radiation sources and detectors of a radiation scanning device according to some embodiments;

19 is a schematic perspective view of a radiation source and detector layout of a radiation scanning device according to some embodiments;

FIG. 20 is a side view of the radiation source and detector layout of the radiation scanning device shown in FIG. 19 viewed along the Z-axis;

FIG. 21 is a schematic plan view of the layout of radiation sources and detectors of the radiation scanning device shown in FIG. 19;

22 is a schematic diagram of the distribution of a single point source of a radiation source of a radiation scanning device according to some embodiments;

FIG. 23 is a schematic structural diagram of a detector of a radiation scanning device according to some embodiments; and

FIG. 24 is a schematic diagram of a disassembly orientation of a detector according to some embodiments.

Detailed ways

In order to clearly describe the technical problems, technical solutions and beneficial effects to be solved by the present application, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the scope of the present application.

In order to solve the above-mentioned various technical problems, embodiments of the present application provide a ray scanning device, which includes: a conveying device, which transports a detected object through a scanning area of the ray scanning device; a ray source, which includes a plurality of ray source modules , each ray source module includes at least one ray source point that emits a ray beam, a plurality of ray source modules are arranged around the scanning area, and are fixed in a plane perpendicular to the conveying direction of the detected object; and a detector, which is used to detect The rays transmitted through the object to be inspected during scanning include a plurality of detector groups, the ends of which are connected to each other to be arranged around the scanning area, and the plurality of detector groups are fixed in a direction perpendicular to the conveying direction of the object to be inspected. In a plane; wherein the detector is located between the radiation source and the scanning area along the vertical direction of the conveying direction of the detected object, the radiation source and the detector are arranged to at least partially overlap along the conveying direction of the detected object, and a plurality of radiation source modules Can be removed and installed independently of each other.

According to the ray scanning device of the embodiment of the present application, the ray source is formed by arranging a plurality of ray source modules around the scanning area, and the plurality of ray source modules can be disassembled and installed independently of each other, that is, each ray source module has a separate cavity to accommodate the respective ray generators. Compared with an integrated ray source surrounding the scanning area, the ray source formed by the combination of multiple ray source modules of the present application can reduce the shell size of a single ray source module and the volume of the internal vacuum cavity, so that a single ray source module is small in size, It is light in weight, which facilitates the disassembly and installation of the radiation source; in addition, multiple target points of a single radiation source module can use separate vacuum chambers, thus reducing the risk of fire in the chamber during maintenance of the radiation source.

According to some embodiments of the present application, the individual cavity of each radiation source module is provided with a mounting and positioning structure, and the mounting and positioning structure is used to fix the radiation source module in a relative position in the radiation scanning device, for example, positioning the radiation source relative to the support frame The module is also used to rotate the ray source module around a predetermined axis to adjust the beam exit angle of the ray beam. In addition, using the installation and positioning structure, the position of each ray source module can be determined, so as to ensure that the multiple ray source modules of the ray source are located in a plane perpendicular to the conveying direction of the detected object after installation (for example, in the same plane or different in-plane).

Here, preferably, the ray source module may be a distributed multi-point source to form a ring structure around the scanning area, such as a rectangular ring, a polygonal ring, or an elliptical ring. Specifically, the ray source modules may be linear distributed multi-point sources, each ray source module may include multiple target points, and the multiple ray source modules may be distributed on the upper side, the lower side, the left side and the right side of the scanning area to form A rectangular ring around the scan area. The ends of the ray source modules can be directly connected to form a continuous rectangular ring, or a discontinuous rectangular ring can be formed with a certain gap. According to other embodiments, the ray source may further include a plurality of short-length linear distributed multi-point sources, and the plurality of short-length linear distributed multi-point sources may alternate with a plurality of longer linear distributed multi-point sources and the ends are directly connected to form a continuous polygonal arrangement, or the ends are arranged at intervals to form a discontinuous polygonal arrangement; alternatively, the ray source may further include a plurality of arc-shaped distributed multi-points with short lengths source, a plurality of arc-shaped distributed multi-point sources can be alternately arranged with a plurality of long linear distributed multi-point sources, and the ends are directly connected to form a continuous rounded rectangular arrangement, or the ends are arranged at intervals A non-continuous rounded rectangular arrangement is formed; alternatively, the radiation source may also include radiation source modules of other numbers, shapes and/or lengths to form other polygonal structures or elliptical structures, etc.

In addition, each ray source module of the ray source can also be a single point source group, each single point source group includes at least two single point sources, preferably, the multiple single point source groups of the ray source are distributed around the bottom of the scanning area Viewing angle, left and right side viewing angle, top viewing angle and corner oblique viewing angle, forming a multi-angle arrangement.

In addition, according to other embodiments, the ray source modules can also be arranged around the scanning area on only three sides, for example, the upper side, the left side and the right side, the upper and lower sides and the left side or the right side, etc. (here, it should be noted that , In this document, the upper, lower, left and right sides of the scanning area refer to the upper, lower, left and right sides when the scanning area is observed along the conveying direction of the detected object). Thus, the radiation source can be arranged as a non-closed structure with one side opening around the scanning area, such as a rectangular structure, a polygonal structure or an elliptical structure with one side opening, and more specifically, it can be opened around one side of the scanning area. Discontinuous or continuous rectangular structures, continuous polygonal structures, continuous rounded rectangles, discontinuous polygons or discontinuous rounded rectangular structures, and other polygonal and elliptical structures, etc. In the case where the ray source consists of a single point source, accordingly, no single point source may be provided on one side of the scanning area.

In the radiation scanning device of the present application, the detector is a structure surrounding the scanning area formed by interconnecting ends of a plurality of detector groups. Preferably, in accordance with the arrangement of the above-mentioned various ray sources, for example, the structure surrounding the scanning area on the upper, lower, left, and right sides, or the non-closed structure opening on one side of the scanning area, such as a rectangular structure, polygonal structure opening on one side of the scanning area Structure or elliptical structure (more specifically, such as continuous or discontinuous rectangular structure opening around one side of the scanning area, continuous or discontinuous polygonal structure, continuous or discontinuous rounded rectangular structure and single point source multi-viewing angle, etc. arrangement), a plurality of detector groups of the detectors are arranged in a closed rectangular structure, a square structure, a polygonal structure or an elliptical structure, etc. surrounding the scanning area. Specifically, each detector group of the detector may include a plurality of detector units and detector arms, and the plurality of detector units are linearly arranged on the detector arms. The detectors may include four detector groups respectively arranged on the upper, lower, left, and right sides of the scanning area to form a closed rectangular structure or a square structure surrounding the scanning area. The detectors may also include a plurality of longer detector groups and a plurality of shorter detector groups to form a closed polygonal structure surrounding the scanning area. Alternatively, according to other embodiments, in accordance with the non-closed structure of the radiation source with an opening on one side of the scanning area, the plurality of detector groups of the detector may also be arranged in a non-closed structure with an opening on one side of the scanning area, for example, one side Open rectangular structure, square structure, polygonal structure or oval structure, etc.

According to some embodiments, the plurality of detector groups of the detector are configured to be independently removable and installable. Thus, each detector group can be disassembled and installed individually, which facilitates the maintenance of the detectors. In addition, the plurality of detector groups of the detectors may be configured to move along the conveying direction of the detected object for disassembly and assembly. Alternatively, in the case where the radiation source is arranged as a non-closed structure with an opening around one side of the scanning area, a plurality of detector groups of the detector can form a part to move along the vertical direction of the conveying direction of the detected object for disassembly and assembly, and another Part of it moves along the conveying direction of the detected object for disassembly and assembly. Therefore, even when the detectors are arranged inside the radiation source along the vertical direction of the conveying direction of the detected object, the detector group can be disassembled and maintained without disassembling the radiation source module, so that Improve the ease of operation of detector disassembly and maintenance.

In addition, according to some embodiments, the disassembly and assembly of the above-mentioned detector group may be performed by means of linear movement cooperation between the detector arm of the detector group and its installation position in the radiation scanning device, such as the support frame of the radiation scanning device, such as linear sliding Or linear rolling fit, etc., for example, it may be the slide guide rail set between the detector arm and the support frame, or the linear ball bearing and the cylindrical shaft.

In addition, according to some embodiments, each detector unit of the detector group includes a detector crystal for receiving radiation, and each detector unit of each detector group is on the detector arm with the detector crystal facing the same direction to arrange. In addition, as mentioned above, in this application, each detector group is located in a plane perpendicular to the conveying direction of the detected object, especially in the same plane, which specifically means that the detector crystals of each detector group are located in the same plane. In the same plane perpendicular to the conveying direction of the detected object. According to other embodiments, the individual detector groups may also be located in different planes perpendicular to the conveying direction of the detected objects.

In the ray scanning device according to the present application, the ray source of any embodiment described above is combined with the detector of any embodiment described above. In the combined state, each ray source module of the ray source is located perpendicular to the detected In the plane of the conveying direction of the object (in one or more planes), each detector group of the detector is located in other planes (especially in the same plane) perpendicular to the conveying direction of the detected object, and the detector is in the conveying direction. The radiation source is located vertically inside the radiation source, and the radiation source and the detector are arranged to at least partially overlap in the conveying direction of the detected object. The at least partial overlap of the radiation source and the detector in the conveying direction of the detected object can reduce the arrangement length of the radiation source and the detector, thereby helping to reduce the length of the entire radiation scanning system.

In some embodiments, each detector group of the detector is arranged so as not to block the ray beams of the ray source modules on the same side, and at the same time can receive the rays from each ray source module on the other side, so that different ray source modules share the same Probe group, which reduces the total number of probes.

In some embodiments, the detector crystals of the respective detector groups of the detectors are arranged at the ends of the detector units along the conveying direction of the detected object, and are arranged immediately adjacent to the same-side radiation source in the conveying direction of the detected object The ray beam edge of the module is arranged, but does not block the ray beam of the ray source module on the same side. In this way, the coverage length of the optical path between the radiation source and the detector can be reduced as much as possible, thereby further reducing the length of the device.

In some embodiments, each radiation source module is arranged such that the radiation beam avoids the detector set on the same side and illuminates the detector crystals of the detector set on the opposite side. More specifically, the ray source module can be rotated relative to a predetermined axis, such as a target axis (for example, by means of the aforementioned installation and positioning structure of the ray source module) to adjust the beam exit angle of the ray beam, so as to make the center of the ray beam of the ray source module. The position illuminates the detector crystals of the opposite detector group. Since the detector crystal of the detector is located at the end of the detector unit in the conveying direction of the detected object and is arranged close to the edge of the ray beam of the ray source on the same side, the ray source module only needs to be rotated by a small angle to make the ray beam The detector crystal is irradiated at the center position of the detector, so that the adverse effect of the ray beam entering the detector crystal surface obliquely on the imaging can be minimized. The adjustment of the beam angle of the ray source can also be achieved by setting the opening direction of the ray source module, adjusting the collimator and other suitable methods.

According to some embodiments, the image processing module of the ray scanning device of the present application is configured to have a data compensation function, which can compensate for missing data of the angle of view and/or repair the reconstructed image, so as to improve the image quality. Specifically, the image processing module is configured to perform image reconstruction in an iterative method, an image threshold inpainting method, or a combination of the two. Thus, the lack of projection data caused by the increase in the distance between the target points at the ends of the adjacent radiation source modules can be compensated, so that the quality of the reconstructed image can be improved.

Embodiments of the present application are described in detail below with reference to the accompanying drawings.

Figure 1 schematically illustrates a radiographic scanning apparatus according to some embodiments of the present application. The radiation scanning apparatus shown in FIG. 1 includes a conveying device 1 , a channel 2 , a radiation source 3 , a detector 4 and a supporting frame 5 . The conveying device 1 is used to transport the detected object 6 through the scanning area of the radiation scanning device, the scanning area being defined by the radiation source 3 and the detector 4 . The detected object 6 enters the channel 2 from the opening at one end of the channel 2 and leaves the opening at the other end of the channel 2 under the drive of the conveyor 1. The channel 2 can shield the radiation of the radiation source 3 relative to the external environment and avoid the radiation of the equipment near the device. It can also limit the volume of the detected object 6 entering the channel 2 . The radiation source 3 is fixed to the support frame 5 on the outside of the channel 2, which is used for emitting a radiation beam to irradiate the detected object 6 during scanning. A detector 4 is also fixed to the support frame 5 on the outside of the channel 2, which is used to detect the radiation transmitted through the detected object 6 during scanning. The support frame 5 is used for supporting and fixing the conveying device 1, the channel 2, the radiation source 3, the detector 4 and other devices, which are fixed relative to the ground. It should be noted that although both the ray source 3 and the detector 4 are arranged outside the channel 2, at the scanning area, the channel 2 is provided with an avoidance area, which will not block the ray beam of the ray source 3 and will not hinder the detector. 4 Receive rays.

The ray scanning apparatus according to the embodiment of the present application may further include a control device, which can control the operation of various components of the ray scanning apparatus, for example, control the emission of rays of the ray source 3, the data output of the detector 4, and the like. The control device may further include an image processing module, which can perform image reconstruction according to the output information of the detector 4 to obtain a scanned image of the detected object 6 .

The conveying device 1 can be, for example, a conveyor belt; the detected object 6 can be, for example, a package, luggage, and other items that need to be safely inspected.

The radiation source 3 may include a plurality of radiation source modules, and each radiation source module is arranged around the scanning area and located in a plane perpendicular to the conveying direction of the detected object 6 . Each ray source module can be arranged in the same plane or in different planes perpendicular to the conveying direction of the detected object 6. In this embodiment, each ray source module is located in the same plane perpendicular to the conveying direction of the detected object 6 (specifically, It means that the ray openings of each ray source module are located in the same plane perpendicular to the conveying direction of the detected object 6) as an example, but the same applies to the case where each ray source module is located on different planes. 1 shows the advancing direction Z of the detected object 6, and the conveying direction of the detected object 6 (hereinafter sometimes referred to as the conveying direction or Z direction) is defined as the advancing direction of the detected object 6, including the reverse direction of the advancing direction . FIG. 1 shows an XYZ coordinate system, which can be used as a reference coordinate system to describe the positions of components in the radiation scanning device. These position descriptions are for the purpose of clearly describing the principles of the present application and are not limiting. The advancing direction Z of the detected object 6 is the same as the Z direction of the XYZ coordinate system.

According to some embodiments, each ray source module of the ray source 3 of the ray scanning device according to the embodiment of the present application may be a distributed multi-point source, and the plurality of ray source modules may be arranged in a rectangular structure, a polygonal structure, an ellipse surrounding the scanning area shaped structures, etc., in which parts of the structure are located below the conveyor 1 to completely surround the conveyor 1 .

Specifically, as a distributed multi-point source, each ray source module can have multiple target points, each target point of each ray source module can generate a ray beam independently, and each target point can be controlled according to the control device according to the control device. A beam of rays is generated at a predetermined timing. The ray beam may be a fan beam with an opening angle A, as shown in FIG. 3 . Of course, the shape of the ray beam is not limited to a fan beam, and may also be a ray beam of other shapes such as a cone beam, a parallel beam, etc., which can be specifically set as required.

The specific arrangement of the radiation source 3 is as follows. FIG. 2 shows a schematic structural diagram of a radiation source and a detector according to some embodiments, wherein a plurality of radiation source modules of the radiation source 3 are arranged in a rectangular structure surrounding the scanning area. Specifically, the ray source 3 includes four ray source modules 31 , 32 , 33 and 34 , each ray source module is a linear distributed multi-point source (ie, a plurality of target points are arranged in a line), and the four ray source modules 31 , 32, 33, 34 are respectively arranged on the upper side, the lower side, the left side and the right side of the scanning area, forming a rectangular structure surrounding the scanning area. The ends of the radiation source modules 31 , 32 , 33 and 34 are spaced apart by a certain distance, thus forming a discontinuous rectangular structure (as shown in (a) of FIG. 4 , the targets are also arranged in discontinuous rectangles).

The arrangement of the radiation source 3 is not limited to the embodiments shown in FIGS. 2 and 4( a ), and other alternative arrangements may also be included. For example, the ends of the radiation source modules 31, 32, 33, and 34 may be directly connected, so that the radiation source 3 is arranged in a continuous rectangular structure around the scanning area (as shown in (b) of FIG. rectangular arrangement). In addition, the ray source 3 may further include four other linear distributed ray source modules 35, 36, 37, 38 on the basis of the embodiment shown in FIG. The radiation source modules 31 , 32 , 33 , and 34 are alternately arranged and the ends are directly connected, so that the radiation sources 3 are arranged in a continuous polygonal structure (as shown in FIG. 4( c ), the target points are arranged in a continuous polygonal structure). In addition, the ray source modules 35, 36, 37, and 38 may be arc-shaped distributed ray sources, which are alternately arranged with the ray source modules 31, 32, 33, and 34 and whose ends are directly connected, so that the ray source 3 is a continuous rounded rectangle. Structural arrangement. Of course, the ends of the ray source modules 31 , 32 , 33 , 34 , 35 , 36 , 37 , and 38 can also be spaced apart by a certain distance, so that the ray source 3 is arranged in a discontinuous polygonal structure or a discontinuous rounded rectangular structure (attached not shown in the figure). In addition, the lengths of the radiation source modules 35, 36, 37, 38 may be the same as or longer than the lengths of the radiation source modules 31, 32, 33, 34, or the radiation source 3 may include other number(s) and/or lengths ray source module, thereby forming a polygonal structure different from the polygon shown in (c) of FIG. 4 . In addition, the radiation source 3 may include other number(s), lengths and/or shapes of radiation source modules, thereby forming an elliptical structure.

In some embodiments, the radiation source modules included in the radiation source 3 can be disassembled and installed independently of each other, that is, each radiation source module has a separate cavity for accommodating a respective radiation generating device. Each radiation source module has a separate cavity, which means that multiple targets of each radiation source module share a single vacuum cavity. The distance between the multiple targets of each ray source module in the vacuum chamber can be determined by the number of targets and the length of the chamber. According to some embodiments, the number of targets in a single radiation source module may be 192, 264, etc., and the distance between targets in a single radiation source module may be 4 mm, 12 mm, and the like. It should be noted here that the distance between the target points at the ends of adjacent radiation source modules is greater than the distance between the target points in a single radiation source module, even if the ends of adjacent radiation source modules are directly connected, that is, two The same is true in the case of a direct connection of individual cavities. Each ray source module has a separate cavity, which has the following advantages: Compared with the ray source with an integral annular cavity (that is, all targets of the ray source are located in the same annular vacuum cavity), the size of a single ray source module can be reduced. The size of the housing and the volume of the internal vacuum cavity reduce the volume and weight of a single ray source module, thus facilitating the disassembly and installation of the ray source; in addition, each ray source module adopts a separate vacuum cavity, which can reduce the need for radiation Risk of fire in the cavity when the module is being serviced.

In addition, according to some embodiments, each ray source module of the ray source 3 is provided with an installation and positioning structure, so as to facilitate the installation and adjustment of the ray source modules. By means of the installation and positioning structure, each ray source module of the ray source 3 can be installed and fixed at a predetermined position in the ray scanning device (for example, at a specific position in the ray scanning device relative to the XYZ reference coordinate system), for example, ensuring that A plurality of radiation source modules are located in the same plane perpendicular to the conveying direction of the detected object 6 . In addition, by means of the installation and positioning structure, the radiation source module can also be rotated to adjust the beam exit angle of the radiation beam.

Each ray source module of the ray source 3 may adopt different installation methods due to different positions in the ray scanning device, and have different installation and positioning structures. For example, the ray source modules located above and beside the scanning area can be installed by means of hoisting through equipment such as overhead cranes. However, the ray source module located below the scanning area is not suitable for hoisting, and needs to be installed in other ways. In order to facilitate the installation of such a radiation source module, the embodiments of the present application provide an installation and positioning structure, which can conveniently install and fix a radiation source module that is not suitable for hoisting at a predetermined position of the radiation scanning device, and can also Rotate the ray source module to adjust the exit angle of the ray beam. According to some embodiments, the installation and positioning structure includes a main body, and the main body can be fixedly connected to the radiation source module and the support frame of the radiation scanning device, so that the radiation source module can be fixedly installed to the support frame through the main body, wherein the installation and positioning structure includes: A moving device, through which the radiation source module can be moved to a predetermined installation position on a first plane (eg, the XZ plane in FIG. 1 ); a first positioning device, which positions the radiation source module on the first plane a lifting device for adjusting the position of the radiation source module along a first direction (eg, the Y direction in FIG. 1, which is perpendicular to the XZ plane), wherein the first direction is perpendicular to the first plane; and a second positioning device, It is used to fix the position of the ray source module in the first direction.

FIG. 5 shows a specific embodiment of the installation and positioning structure of the above-mentioned radiation source module. As shown in FIG. 5 , the installation and positioning structure includes main bodies 11 and 12. The main bodies 11 and 12 are respectively located at both ends of the ray source module along the length direction, and are fixedly connected to the ray source module (here, the ray source module is shown in FIG. 2 ). The ray source module 33 of the ray source 3 is described as an example, and can also be other suitable ray source modules), and the ray source module 33 is fixedly installed on the support frame 5 (not shown in FIG. 5 ) via the main bodies 11 and 12 . The moving device for installing the positioning structure is specifically provided as rollers 13 and 14, which are respectively arranged on the main bodies 11 and 12. The radiation source module 33 can be pushed through the rollers 13 and 14 to move to a predetermined installation position on the XZ plane. Of course, the moving device for the installation and positioning structure is not limited to the roller. According to other embodiments, the ray source module can also be moved in a sliding manner. The source module 33 is moved to a predetermined installation position.

The first positioning device includes first positioning pins 15, 16 and corresponding first pin holes (not shown in the figure) respectively provided on the main body 11, 12 and the support frame 5 of the ray scanning device. After the rollers 13 and 14 are moved to the predetermined installation positions, the first positioning pins 15 and 16 are respectively inserted into the corresponding first pin holes, so that the radiation source module 33 can be positioned on the XZ plane.

The lifting device includes a roller 13 provided at the main body 11, wherein the roller 13 is specifically configured as a liftable roller, and also includes a lifting jack wire 17 arranged on the main body 12, one end of the lifting jack wire 17 abuts against the support frame 5. The main body 12 and the radiation source module 33 can be lifted or lowered relative to the support frame 5 by twisting the jacking wire 17 . The position of the radiation source module 33 relative to the support frame 5 can be adjusted along the Y direction by adjusting the elevating roller 13 and the jacking wire 17 . The second positioning device is formed as positioning pads 19 and 20. After adjusting the ray source module 33 to a predetermined position along the Y direction by adjusting the elevating roller 13 and the jacking wire 17, the positioning pads 19 and 20 are respectively placed on the Below the main bodies 11 and 12, the height of the radiation source module 33 relative to the support frame 5 can be fixed, so that the radiation source module 33 is positioned along the first direction Y. Here, in particular, the positioning block 20 under the main body 12 can be arranged in a U-shape, and the lower part of the lifting jack wire 17 is located in the opening of the U-shaped positioning block 20 to prevent the two from interfering with each other. In addition, the installation and positioning structure may also include first fixing bolts 21 and 22 and corresponding first threaded holes provided in the main body 11 and 12 , the positioning pads 19 and 20 and the support frame 5 . The first fixing bolts 21 and 22 are respectively Inserted into the corresponding first threaded holes and tightened, the positioning blocks 19 and 20 can be fixed relative to the main bodies 11 and 12 and the support frame 5 , and the radiation source module 33 can be fixedly connected to the support frame 5 .

In addition, according to some embodiments, the installation and positioning structure further includes an adjustment device, and the adjustment device is used for rotating the radiation source module along a predetermined axis to adjust its beam exit angle. According to the specific embodiment of FIG. 5 , the ray source module 33 is provided with an installation shaft 331 , the main bodies 11 and 12 are respectively provided with shaft holes, and the main bodies 11 and 12 are installed on the installation shaft 331 through the shaft holes; in addition, the installation and positioning structure also includes The second positioning pins 23 and 24, the main bodies 11 and 12 and the radiation source module 33 are respectively provided with second pin holes corresponding to the second positioning pins 23 and 24. By fitting the shaft holes of the main bodies 11 and 12 to the mounting shaft 331 and inserting the second positioning pins 23 and 24 into the corresponding second pin holes respectively, so that the main bodies 11 and 12 can be positioned relative to the radiation source module 33 . In addition, the mounting and positioning structure further includes second fixing bolts 25 and 26 for fixing and connecting the main bodies 11 and 12 relative to the radiation source module 33 , and corresponding second threaded holes provided on the main bodies 11 and 12 and the radiation source module 33 . , by screwing the second fixing bolts 25 and 26 into the corresponding second threaded holes, the main bodies 11 and 12 can be fixedly connected with respect to the radiation source module 33 . Pulling out the second positioning pins 23 and 24 and loosening the second fixing bolts 25 and 26 can loosen the main bodies 11 and 12 from the radiation source module 33 . In this state, the adjusting device can drive the radiation source module 33 It rotates relative to the main bodies 11 and 12 around the mounting axis 331 .

In a specific embodiment, the adjustment device includes a rotational drive mechanism, the rotational drive mechanism includes an adjustment block 27 fixed on the ray source module 33 and a top wire 28 provided on the main body 11 against the adjustment block 27. The top wire 28 It can be screwed to push the adjustment block 27 to move so as to make the radiation source module 33 rotate. Here, the rotation driving mechanism is only arranged on one main body of the installation and positioning structure, that is, only arranged at one end of the radiation source module 33 along the length direction. Since both ends of the ray source module 33 are supported by the installation shaft 331 , the ray source module 33 is pushed to rotate at one end of the ray source module 33 , and the entire ray source module 33 can be rotated correspondingly. After the radiation source module 33 is rotated through a predetermined angle, the second positioning pins 23 and 24 are inserted into the corresponding second pin holes again, and the second fixing bolts 25 and 26 are screwed into the corresponding second threaded holes again. The main bodies 11 and 12 can be fixedly connected with respect to the radiation source module 33 .

In the above-mentioned embodiment, the installation axis 331 on the radiation source module 33 may coincide with the virtual connection line of the multiple target points in the radiation source module 33. Therefore, rotating the radiation source module 33 around the installation axis 331 can make the radiation source module 33 Rotate around the target axis.

In addition, although the ray source module 33 of the ray source 3 in FIG. 2 is used as an example to describe the installation and positioning structure according to the above embodiment, the above-mentioned installation and positioning structure can be applied to the installation, positioning and adjustment. Of course, the installation, positioning and adjustment of the ray source module 33 of the ray source 3 in FIG. 2 are not limited to the installation and positioning structure of the above-mentioned embodiment, and any other suitable structure can also be adopted. For example, in the embodiment shown in FIG. 5, the lifting device is realized by the liftable roller 13 and the lifting jack wire 17, but the lifting device is not limited to the specific structure of this embodiment, and can also be implemented as other suitable structures, such as Lifting jacks are used on both main bodies to lift and lower. Likewise, the specific implementations of the moving device, the first positioning device, the second positioning device, and the adjusting device are not limited to the specific structures in the above embodiments, and other suitable structures may be adopted as long as their functions can be realized.

In the above embodiment, the ray source module of the ray source 3 of the ray scanning device shown in FIG. 1 is a distributed ray source, but alternatively, the ray source 3 may also be composed of a plurality of single-point source groups, wherein each A single point source group includes at least two single point sources. Each single point source may individually emit a beam of rays, such as a fan beam with an opening angle A (as shown in Figure 3). Each single point source of the radiation source 3 can emit radiation according to a predetermined sequence under the control of the control device of the radiation scanning system. Figure 4(d) shows a layout of a ray source including multiple single point source groups, according to some embodiments. As shown in (d) of FIG. 4 , the ray source includes a plurality of single-point source groups arranged around the scanning area at the bottom viewing angle, left viewing angle, right viewing angle, top viewing angle and corner oblique viewing angle, wherein: bottom viewing angle single point The source group includes 3 single point sources, which are arranged in the bottom left viewing angle, the bottom middle viewing angle and the bottom right viewing angle respectively; the single point source group in the top viewing angle includes 3 single point sources, which are respectively arranged in the top left viewing angle, the top middle viewing angle and the top right viewing angle. Viewing angle; the left viewing angle single point source group includes 2 single point sources, which are arranged in the upper left viewing angle and the lower left viewing angle respectively; the right viewing angle single point source group includes 2 single point sources, which are arranged at the upper right viewing angle and the lower right viewing angle respectively. Side viewing angle; Corner oblique viewing angle single point source group includes 4 single point sources, which are respectively arranged in upper left oblique viewing angle, upper right oblique viewing angle, lower left oblique viewing angle and lower right oblique viewing angle. According to other embodiments, each single-point source group may further include more single-point sources, respectively. Similarly, each single-point source may include its own mounting and positioning structure to mount and position the single-point source, thereby ensuring that multiple single-point sources are located in the same plane perpendicular to the conveying direction of the detected object 6 . The installation and positioning structure can also be used to rotate the single point source to adjust the beam angle of the rays of each single point source.

Next, the arrangement of the detector 4 of the radiation scanning apparatus shown in FIG. 1 will be described in detail. The detector 4 may include a plurality of detector groups, the plurality of detector groups are located in a plane perpendicular to the conveying direction of the detected object 6, and the ends of each detector group are connected to each other to be arranged around the scanning area. Multiple detector groups may be located in the same plane or in different planes perpendicular to the conveying direction of the detected object 6, and are preferably arranged in the same plane. different planes. Specifically, each detector group of the detector 4 is a detector array including a plurality of detector units, and the plurality of detector groups can be arranged in a closed square structure, a rectangular structure, a polygonal structure or an elliptical structure surrounding the scanning area , in which part of the structure is located below the conveyor 1 to completely surround the conveyor 1 .

Figure 2 shows a detector arrangement according to some embodiments, wherein detector 4 comprises four detector groups 41, 42, 43, 44, each detector group 41, 42, 43, 44 being a linear detector array , including a plurality of detector units arranged in a straight line. Four detector groups 41 , 42 , 43 , 44 are arranged on the upper, lower, left and right sides of the scanning area and the ends are connected to each other to form a closed rectangular structure (as shown in FIG. 6( a )) or a square structure. The arrangement of the detectors 4 is not limited to the embodiment shown in FIGS. 2 and 6( a ), and alternatively, it may be arranged in other structures. For example, the detector 4 may comprise four longer linear detector arrays and four shorter linear detector arrays alternately arranged around the scanning area and interconnected at the ends to form a closed polygonal structure (eg shown in (b) of FIG. 6 ). The detectors 4 may include other numbers of multiple longer linear detector arrays and other numbers of multiple shorter linear detector arrays alternately arranged around the scanning area and interconnected at their ends to form a closed Other polygonal structures. The detector 4 may also include other numbers, lengths and/or shapes of detector groups to form other shapes of closed structures, such as elliptical structures and the like.

The detector group in the form of a linear detector array may adopt any suitable structure, and according to some embodiments, its specific structure may be as shown in FIG. 7 . As shown in FIG. 7 , the detector group includes a plurality of detector units 45 and a detector arm 46 , and the plurality of detector units 45 are arranged side by side along a straight line on the detector arm 46 . The specific structure of the detector unit 45 can be as shown in FIG. 8 , and of course other suitable structures can also be used. As shown in FIG. 8, the detector unit 45 includes a detector crystal 451 for receiving radiation. A plurality of detector units 45 are arranged side by side on the detector arm 46 with the detector crystals 451 facing the same direction. The structure of the detector arm 46 is not limited to the embodiment shown in FIG. 7 , and other suitable structures may also be adopted (the structure of the detector arm shown in FIG. 9 and FIGS. 15-17 later). The detector group of the present application is not limited to the form of a linear detector array, but can also be in the form of an arc-shaped detector array, so as to form a detector with an elliptical structure. The arc-shaped detector array may include a plurality of arc-shaped detector units and arc-shaped detector arms, the plurality of arc-shaped detector units being arranged side by side on the arc-shaped detector arms, wherein the detector crystals of the detector units are oriented in the same direction. direction.

According to some embodiments, each detector group of the detector 4 is independently removable and installable, thereby improving the maintainability of the detector. In addition, in particular, the plurality of detector groups of the detector 4 are configured to be disassembled, installed and adjusted along the conveying direction of the detected object 6, so that when the detector 4 is arranged at the radiation source 3 along the conveying direction perpendicular to the detected object 6 When it is inside, the detector group can be disassembled, adjusted and maintained without disassembling the radiation source, which further improves the maintainability of the detector.

Specifically, with the aid of the installation and fixing structure of the detector group of the present application, the detector group of the detector 4 can be relative to its installation position in the ray scanning device (for example, the support frame 5 ) along the conveying direction of the detected object 6 move to remove from or install to the mounting position.

Hereinafter, the mounting and fixing structure for the detector group according to some embodiments of the present application will be described in detail. The mounting and fixing structure of the detector group according to some embodiments of the present application specifically includes a first mounting portion, which is fixedly arranged on the detector group; a second mounting portion, which is fixedly arranged on the support frame of the radiation scanning device, and Coordinated with the first mounting part for linear movement, wherein the detector group can move to a predetermined mounting position along the second mounting part when the first mounting part and the second mounting part cooperate with each other; and a fixing device, which is arranged on the detector group One side along the width direction is used to fix the detector group relative to the installation reference plane on the support frame. In some specific embodiments, the detector group is mounted and fixed to the support frame of the ray scanning equipment via the detector arm, wherein the first mounting part is fixedly arranged on the detector arm of the detector group, and the fixing device is arranged on the detector arm On one side along the width direction, fix the detector arm to the support frame to fix the detector group.

Figure 9 shows the installation and fixing structure of the detector group according to some specific embodiments, wherein Figure (a) shows an exploded perspective view of the detector arm and the installation and fixing structure, and Figure (b) is the installation and fixing state of the detector group A partial cutaway view of the detector arm. The complete detector set is not shown in FIG. 9, only the detector arm is shown, wherein a plurality of detector units can be arranged lengthwise side by side on the shown detector arm to form a complete detector set.

As shown in FIG. 9 , the first mounting portion of the mounting and fixing structure of the detector group is specifically formed as a chute 471 extending in the width direction of the detector arm 47 , wherein the first mounting portion of the mounting and fixing structure of the detector group is mounted on the support frame 5 of the radiation scanning device. In the state, the width direction of the probe arm 47 corresponds to the conveying direction of the detected object 6 . The second mounting portion is formed as a sliding rod 472 matched with the sliding groove 471 . The chute 471 is formed as a semicircular open chute, and the sliding bar 472 is correspondingly formed as a cylindrical sliding bar. The sliding bar 472 is fixed on the support frame 5 or integrally formed with the support frame 5 , and its length direction is consistent with the conveying direction of the detected object 6 . One end of the sliding rod 472 close to the support frame 5 is arranged to increase in size relative to the rest of the sliding rod 472 to form a convex portion 473 . An end surface of the convex portion 473 facing the probe arm 47 is formed as a mounting reference surface 474 for abutting against a surface 475 of one side in the width direction of the probe arm 47 . The surface 475 is the mounting surface of the detector arm 475, and both the mounting surface 474 and the mounting reference surface 474 are processed to have good flatness. When the mounting surface 475 of the detector group is positioned against the mounting reference surface 474, in the width direction, That is, the detector group is accurately positioned in the conveying direction of the detected object 6 . The convex part 473 can also be used as a limiting part. When installing the detector group, align the sliding groove 471 with the sliding rod 472 and push the detector arm 47 toward the support frame 5 along the sliding rod 472 until the detector arm 47 abuts The convex portion 473 can move the probe arm 47 to a predetermined installation position.

The fixing device is provided at the other end of the sliding rod 472 opposite to the convex portion 473, and is arranged to abut against both sides of the detector arm 471 in the width direction with the convex portion 473, respectively, thereby defining the width direction of the detector arm 47. Location. Specifically, the fixing device includes a positioning sleeve 476 and a fastener 477 . The positioning sleeve 476 is sleeved on the other end of the sliding rod 472 opposite to the convex portion 473 and abuts against the other side of the detector arm 47 along the width direction. Surface 478 , fastener 477 secures locating sleeve 476 to the other end of slide bar 472 opposite protrusion 473 . Specifically, the fastener 477 can be a fastening screw, the positioning sleeve 476 and the other end of the sliding rod 472 are both provided with threaded holes, and the fastening screws are screwed into the threaded holes to tighten relative to the sliding rod 472 The position sleeve 476 is fixed, thereby fixing the detector arm 47 in the width direction relative to the sliding rod 472 (ie, the support frame 5 ). At the same time, the detector arm 47 can be fully positioned and fixed, since the other degrees of freedom are limited by the form fit of the sliding rod 472 and the sliding groove 471 .

Through the above-mentioned installation and fixing structure, when the detector group is installed, in the state where the detector unit faces the scanning area and the width direction is consistent with the conveying direction of the detected object 6 , first align the sliding groove 471 of the detector arm 47 with the sliding rod 472, move the detector arm 47 along the sliding rod 472 until it abuts against the convex part 473; then, set the positioning sleeve 476 on the end of the sliding rod 472 opposite to the convex part 473, and screw it relative to the sliding rod 472 fixed, thereby fixing the detector arm 47 . When disassembling the detector group, do the opposite operation.

Through the above-mentioned installation and fixing structure, since the sliding rod 472 extends along the conveying direction of the detected object 6, that is, the linear movement between the detector group and the supporting frame 5 is along the conveying direction of the detected object, and the fixing device is arranged on the detector. One side of the group along the width direction, and the width direction of the detector group is consistent with the conveying direction of the detected object 6 . Therefore, with the aid of the above-mentioned mounting and fixing structure, the detector group can be moved along the conveying direction of the detected object 6 for installation or disassembly, and the fastening operation can also be performed on one side of the detector group along the conveying direction of the detected object, Therefore, the detector can be disassembled or maintained from the side along the conveying direction of the detected object, and even if the detector is arranged inside the radiation source perpendicular to the conveying direction, its disassembly or maintenance can avoid the radiation source The obstruction can be carried out without disassembling the radiation source, thereby improving the convenience of disassembly and maintenance of the detector.

Furthermore, preferably, the second mounting portion of the above-mentioned mounting and fixing structure is configured to support the detector group at a predetermined mounting position in a state of being matched with the first mounting portion. Specifically, the second mounting portion includes two sliding rods 472 , and the detector arm 47 is correspondingly formed with two sliding grooves 471 , which are disposed at both ends of the detector arm 47 along the length direction, so that the detector arm 47 is in the After the two sliding rods 472 are moved to the predetermined installation positions, the two sliding rods 472 can support the detector group at the predetermined installation positions without other auxiliary structures and/or tools. In this way, when the detector group is fastened, the detector group can be operated without additional tools and without the operator supporting the detector group, thereby improving the convenience of operation.

Although the detector arm is shown in the vertical direction in FIG. 9 , the above-mentioned installation and fixing structure is not limited to the installation and removal of detector groups arranged vertically in the ray scanning equipment, and detector groups arranged in other directions are not limited to installation and removal. The above-mentioned mounting and fixing structure can also be used.

Of course, the mounting and fixing structure between the detector group and the supporting frame 5 is not limited to the embodiment shown in FIG. 9 , and other suitable mounting and fixing structures may also be used. For example, according to some embodiments, the linear movement of the mounting and fixing structure may be It is other suitable fit, such as linear rolling fit such as the fit of a linear ball bearing and a cylindrical shaft. According to other embodiments, the cross-section of the chute 471 is not limited to a semicircle, but can be a semi-rectangular shape, and accordingly, the sliding rod The 472 is not limited to a cylinder, and can also be a prism or the like that matches the chute 471 .

In addition, when the detector includes a plurality of detector groups, the installation reference plane of each of the plurality of detector groups is set in the same plane perpendicular to the conveying direction of the object 6 to be detected, so that the plurality of detector groups can be secured. After installation, it is in the same plane perpendicular to the conveying direction of the detected object 6 . Specifically, if each detector group is installed using the mounting and fixing structure shown in FIG. 9 , the end face of the convex portion 473 corresponding to each detector group facing the detector arm 47 , that is, the installation reference surface 474 is located at the same position as the detector arm 47 . The conveying direction of the detected object 6 is perpendicular to the same plane, and the mounting surfaces 475 along the width direction of each detector group are fixed against the respective mounting reference planes 474, and the plurality of detector groups must be located at the position after being installed. In the same plane perpendicular to the conveying direction of the detected object 6 .

Below, the relative arrangement of the radiation source 3 and the detector 4 of the radiation scanning device according to the embodiment of the present application is further described. As mentioned above, the ray source 3 includes a plurality of ray source modules, and each ray source module is arranged around the scanning area and is located in the same plane perpendicular to the conveying direction of the detected object 6; the detector 4 includes a plurality of detector groups, The plurality of detector groups are located in the same plane perpendicular to the conveying direction of the detected object 6 , and the ends of the respective detector groups are connected to each other to be arranged around the scanning area. Further, in the combined state of the radiation source 3 and the detector 4, the detector 4 is arranged inside the radiation source 3 in the vertical direction of the conveying direction of the detected object 6, and the radiation source 3 and the detector 4 are arranged at the inner side of the radiation source 3. The conveying direction of the detected object 6 at least partially overlaps, wherein the multiple radiation source modules of the radiation source 3 can be arranged in a rectangular structure, a polygonal structure, an elliptical structure, etc., as in any of the aforementioned embodiments, and the multiple detectors 4 The detector groups are arranged in a square structure, a rectangular structure, a polygonal structure, an elliptical structure, etc., as in any of the aforementioned embodiments. Below, the detailed arrangement of the ray source 3 and the detector 4 in the combined state will be described by taking the embodiment shown in FIG. 2 as an example. In FIG. 2 , the four linearly distributed ray source modules 31 , 32 , and 33 of the ray source 3 , 34 are arranged in a discontinuous rectangular structure, and the four linear detector arrays 41, 42, 43, 44 of the detector 4 are arranged in a closed rectangular structure. 3 and any other combination of detector 4 structures.

Preferably, each detector group 41 , 42 , 43 , 44 of the detector 4 is arranged so as not to block the ray beams of the ray source modules on the same side, while being able to receive rays from the ray source modules on the other sides. Since both the ray source 3 and the detector 4 are arranged in a ring shape, the same detector group can be shared by different ray source modules of the ray source. Figure 10 shows the correspondence between each ray source module and the detector group that receives its rays, wherein the ray beams of each target point of each ray source module 31, 32, 33, 34 of the ray source 3 are in a fan-shaped beam (such as The ray beam with the opening angle A shown in FIG. 3 is shown as an example, the ray beam emitted by each ray source module 31, 32, 33, 34 can be detected by the three-side detector group of the detector 4, and can receive Detector groups for rays and their parts are represented by thick solid lines. (a) of FIG. 10 shows the detector group and its part corresponding to the ray beam of the ray source module 31 above the scanning area, wherein the detector groups 42 , 43 and 44 of the detector 4 receive the rays from the ray source module 31 10(b) shows the detector group and its part corresponding to the ray beam of the ray source module 32 on the right side of the scanning area, wherein the detector groups 41, 43, 44 of the detector 4 receive the ray source module 32 ray beam; FIG. 10(c) shows the detector group and its part corresponding to the ray beam of the ray source module 33 on the lower side of the scanning area, wherein the detector groups 41, 42 and 44 of the detector 4 receive The ray beam of the ray source module 33; FIG. 10(d) shows the detector group and its part corresponding to the ray beam of the ray source module 34 on the left side of the scanning area, wherein the detector groups 41, 42, 43 receives the radiation beam from the radiation source module 34 . As can be seen from Figure 10, the rays of one ray source module can be received by other side detector groups except the same side detector group, and different ray source modules can share the same detector group, for example, the ray source modules 31 and 32 share the same detector group. The detector groups 43 and 44, the ray source modules 32 and 33 share the detector groups 41 and 44, and the ray source modules 33 and 34 share the detector groups 41 and 42. In addition, in addition to being detected by the detector group on the opposite side, the rays of each ray source module can also be received by other side detector groups except the detectors on the same side. Therefore, the rays of each ray source module can be as far as possible. may be detected by detectors. Therefore, the detector of the present application can improve the image quality while reducing the number of detector groups and equipment cost.

In addition, preferably, the detector crystals of the respective detector groups of the detector 4 are arranged at the ends of the detector units along the conveying direction of the detected object 6 , and are arranged to be immediately adjacent to the same side in the conveying direction of the detected object 6 . The ray beam edge of the ray source module, but does not block the ray beam of the ray source module on the same side. Therefore, the coverage length of the optical path between the radiation source and the detector can be reduced as much as possible, thereby reducing the length of the device. The details are shown in Figure 11 and Figure 12. 11 is a schematic cross-sectional structure diagram of the radiation scanning apparatus shown in FIG. 1 along the center line of the conveying direction of the object to be detected, according to some embodiments. As shown in FIG. 11 , the detector unit may be, for example, the detector unit 45 shown in FIG. 7 , and the detector crystal may be, for example, the detector crystal 451 shown in FIG. 7 ; The conveying direction is arranged at the end of the detector unit 45 along the conveying direction of the detected object 6 , and at the same time, other components of the detector group, such as other elements of the detector unit 45 and the detector arm, etc. The ends are flush with the detector crystal 451, and both avoid the ray beam exit of the ray source on the same side. In addition, FIG. 12 shows a schematic top view of the layout of the detector and the radiation source according to some embodiments, the radiation source modules on the left and right sides in the figure are the radiation source modules 34 and 32 of the radiation source 3, respectively. Detector crystals 451-4 and 451-2 represent the positions of detector crystals of detector groups 44 and 42, respectively. As can be seen from FIG. 12 , the detector crystal 451-4 is disposed close to the edge of the ray beam of the ray source module 34 on the same side in the conveying direction of the detected object 6, and does not block the ray beam of the ray source module 34 on the same side; The detector crystal 451 - 2 is disposed close to the edge of the ray beam of the ray source module 32 on the same side in the conveying direction of the detected object 6 , and does not block the ray beam of the ray source module 32 on the same side. With the above configuration, the radiation source 3 and the detector 4 can overlap in the conveying direction of the detected object 6 to the greatest extent, so that the coverage length of the optical path between the radiation source and the detector can be reduced as much as possible, thereby reducing the device length.

More particularly, the respective radiation source modules of the radiation source 3 are arranged such that the radiation beam avoids the detector group on the same side and illuminates the detector crystals of the detector group on the opposite side. As shown in FIG. 12 , the ray beam of the ray source module 34 can cover and illuminate the detector crystal 451 - 2 of the detector group 42 on the opposite side while avoiding the detector group 44 on the same side. The beam can also cover and illuminate the detector crystals 451 - 4 of the detector group 44 on the opposite side while avoiding the detector group 42 on the same side. Furthermore, each radiation source module of the radiation source 3 is arranged to irradiate the detector crystals of the detector groups on the opposite side with the central position of the radiation beam. Specifically, the ray source module can be rotated relative to the target axis by a predetermined angle to adjust the beam exit angle of the ray beam of the ray source module, so that the center position of the ray beam illuminates the detector crystal. Here, the target axis refers to a virtual line connecting a plurality of target points in the radiation source module. Since the detector crystal of the detector is located at the end position of the detector unit in the conveying direction of the detected object 6 and is arranged close to the beam edge of the radiation source on the same side, the radiation source module can only be rotated by a very small predetermined angle, for example, it can be is 1.5 degrees, so that the center position of the ray beam illuminates the detector crystal. In this way, the adverse effect of the ray beam obliquely incident on the detector crystal surface on imaging can be minimized. In addition, the rotation of the ray source module is not limited to the rotation around the target axis, and can also be rotated relative to other axes than the target axis to adjust the beam exit angle of the ray beam, wherein the rotation of the ray source relative to the target axis or other axes can be determined by the above-mentioned The installation and positioning structure of the ray source module described above is realized. In addition, the method of adjusting the beam exit angle of the ray beam is not limited to the above-mentioned embodiment, and other methods, such as changing the opening direction of the ray source module, adjusting the collimator, and other suitable methods, can also be used to change the beam exit angle. It is sufficient as long as the above-mentioned arrangement of the radiation source can be realized.

In the ray scanning device of the embodiment of the present application, the ray source is composed of a plurality of ray source modules, and the ends of the plurality of ray source modules are directly connected or arranged at intervals. In the case where the ends of the ray source modules are directly connected, due to the mechanical connection structure between the ends, the ray source points between adjacent ray source modules must be discontinuous, such as the target at the ends of two adjacent ray source modules. The distance between the points is significantly larger than the distance between the target points inside the radiation source module; this is especially true when the ends of the radiation source module are arranged at intervals. Therefore, projection data is lacking due to lack of target points at the ends of adjacent ray source modules during scanning. In this regard, according to some embodiments, the image processing module of the radiation scanning device of the present application is configured to have a data compensation function, which can compensate for missing data of a viewing angle and/or repair the reconstructed image to improve image quality. Specifically, the image processing module is configured to perform image reconstruction in an iterative method, an image threshold inpainting method, or a combination of the two.

The iterative method specifically includes the following steps:

Step 1: Image reconstruction using missing perspective data, where the missing perspective data is the initial data measured by the detector, and the initial data lacks the projection data of the perspective without the target point, for example, when the ray scanning equipment uses Figure 2 or Figure 2. When the ray source with discontinuous rectangular structure is shown in (a) of 4, the initial data measured by the detector lacks the projection data at the oblique angle of the four corners of the rectangular structure;

Step 2: Perform forward reprojection on the reconstructed image obtained in step 1 according to the complete geometry. Here, the reconstructed image obtained in step 1 may present an object with incomplete geometric structure due to the missing data of the viewing angle. Forward reprojection refers to forward reprojection when the geometric shape is completed. Specifically, the geometric shape can be completed through speculation, assumption, etc.;

Step 3: Using the re-projection data obtained in Step 2 as a reference, use an image repair algorithm to repair the missing data in the projection domain, and use the repaired data to reconstruct the image again;

Step 4: Iterate several times for the foregoing forward reprojection step, missing data restoration step and image reconstruction step, and use the image obtained in the last image reconstruction step as the final reconstructed image.

In the above iterative method, the convergence threshold can be preset. When the image obtained in the image reconstruction step meets the set convergence threshold, the iteration is stopped, and the image is used as the final reconstructed image; when the image obtained in the image reconstruction step does not meet the set convergence threshold, the next step is continued. One iteration, ie, forward reprojection step, perspective missing data repair step, and image reconstruction step, until the image obtained in the image reconstruction step satisfies the set convergence threshold.

In the above iterative method, the image restoration algorithm in step 2 includes various traditional algorithms, such as methods based on TV regular terms, wavelet analysis, dictionary learning, etc., and artificial neural network methods.

Among the above-mentioned iterative methods, image reconstruction methods include common algorithms such as analytical algorithms and iterative algorithms.

According to other embodiments, the image processing module may also use an image threshold inpainting method to obtain the reconstructed image. Specifically, the image processing module can use the missing perspective data, that is, the initial data measured by the detector, to perform image reconstruction, and use an image restoration algorithm to perform artifact removal and data correction processing on the reconstructed image at the image threshold to obtain The final reconstructed image. In this embodiment, the image restoration algorithm includes various traditional algorithms, such as methods based on TV regular terms, wavelet analysis, dictionary learning, etc., and artificial neural network methods.

According to other embodiments, the image processing module may use a combination of the above-mentioned iterative method and the above-mentioned image threshold restoration method to perform image reconstruction, so as to improve the image quality. Specifically, the image processing module can first use the above-mentioned iterative method to complete the missing data in the projection domain, and obtain a reconstructed image that meets the set convergence threshold, and then use the above-mentioned image threshold repair method to reconstruct the image obtained by the above-mentioned iterative method. At the image threshold, the image inpainting algorithm is used for artifact removal and data correction, and the final reconstructed image is obtained.

Compared with the ray source using distributed multi-point sources, the source points of the ray source in the form of a single point source are relatively sparse, and the image processing module can use an image reconstruction algorithm suitable for sparse viewing angle data to obtain scanned images.

In the radiation scanning device of the foregoing embodiment, the radiation source surrounds the scanning area on four sides, up, down, left, and right. According to other embodiments, the present application also provides a ray scanning device, the arrangement of which is basically the same as that of the ray scanning device in the previous embodiment, the difference mainly lies in the arrangement of the ray sources, wherein the ray sources are only on the upper side, the lower side and the left and right sides around the scan area on one side. The following description takes the example that the radiation sources are arranged on the upper side, the lower side and the right side of the scanning area, but the same applies to the case where the radiation sources are arranged on the upper side, lower side and the left side of the scanning area.

Specifically, in the ray scanning device of the foregoing embodiment, each ray source module of the ray source 3 is a distributed multi-point source, and the plurality of ray source modules can be arranged in a rectangular structure, a polygonal structure, an elliptical structure, etc. around the scanning area . In this embodiment, the multiple ray source modules of the ray source can still be distributed multi-point sources, the difference is that the multiple ray source modules are arranged in a non-closed structure that surrounds the scanning area and opens on the left side of the scanning area, for example, the left Rectangular structure, polygonal structure, elliptical structure, etc. with side openings, here, the left side of the scanning area refers to the left side of the scanning area in the vertical direction of the conveying direction of the object to be detected 6 . In the foregoing embodiment, the ray source 3 has a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygonal or discontinuous rounded rectangular structure, and other polygonal and elliptical structures. Correspondingly, in this embodiment, the ray source is in a discontinuous or continuous rectangular structure, continuous polygonal structure, continuous rounded rectangle, discontinuous polygonal or rounded rectangular structure opening on the left side of the scanning area and other polygonal and elliptical structural arrangements, for example, with respect to the ray source described in FIG. 2 , the ray source 3 in this embodiment at least does not include the ray source module 34 on the left side of the scanning area; for example, with respect to FIG. 4 (b) - The radiation source shown in (c) of FIG. 4 , the radiation source 3 of this embodiment at least does not include the radiation source module on the left side of the detected object 6 .

In addition, the same as the previous embodiment, the ray source of this embodiment can also be composed of multiple single point source groups, and the difference from the previous embodiment is only that the ray source 3 of this embodiment does not include the single point source at the left viewing angle , or excluding the left-side view and single point sources at the top-left and bottom-left oblique views.

Except for the above differences, other features of the ray source in this embodiment are the same as the ray source 3 in the previous embodiment.

The features of various aspects of the detector of this embodiment are basically the same as the detector 4 in the previous embodiment, the only difference is that in this embodiment, the detector is not scanned around the upper side, the lower side and the right side only For the radiation source combination in the area, the detector 4 on the same side of the detector group on the left side of the scanning area has no radiation source module. Therefore, the disassembly and installation of each detector group of the detector 4 can be carried out in the same manner as in the previous embodiment, but also in a different manner from the previous embodiment as described below, so as to further facilitate the disassembly and installation of the detector and the maintain. Specifically, taking the combination of a detector group and a ray source shown in FIG. 13 as an example (wherein, the detector group is the same as the detector group shown in FIG. 2 , and the ray source lacks scanning compared with the ray source shown in FIG. 2 The ray source module on the left side of the area), the detector 4 can be disassembled and installed in the following way: the detector groups 41', 43', 44' are perpendicular to the conveying direction of the detected object 6 (as shown in Figure 14, along the X direction ) is disassembled or installed relative to the support frame 5 , and the detector group 42 ′ is disassembled or installed relative to the support frame 5 along the conveying direction of the detected object 6 (as shown in FIG. 14 , along the Z direction).

The detector group 42' can be disassembled or installed relative to the support frame 5 using the same mounting and fixing structure (as shown in FIG. 9 ) as in the previous embodiment. However, the installation and fixing structures of the foregoing embodiments are not suitable for the disassembly or installation of the detector groups 41', 43', 44' along the X direction, so different installation and fixing structures are required. Specific embodiments of these mounting and fixing structures will be described in detail below.

Similar to the mounting and fixing structures of the foregoing embodiments, the mounting and fixing structures suitable for the disassembly and assembly of the detector groups 41 ′, 43 ′, 44 ′ in the X direction also specifically include a first mounting portion, which is fixedly arranged on the detector groups a second installation part, which is fixedly arranged on the support frame of the ray scanning device and is matched with the first installation part in a linear movement, wherein the detector group can move along the first installation part in the state where the first installation part and the second installation part cooperate with each other. Two installation parts move to a predetermined installation position; and a fixing device, which is arranged on one side of the detector group along the width direction, and is used for fixing the detector group relative to the installation reference plane on the support frame. In some specific embodiments, the detector groups 41 ′, 43 ′, 44 ′ are mounted and fixed to the support frame of the radiation scanning equipment via the detector arm, wherein the first mounting portion is fixedly arranged on the detector arm, and the fixing device is arranged On one side of the detector arm in the width direction, it fixes the detector arm to the support frame to fix the detector group.

Fig. 15 shows an installation and fixing structure suitable for the detector group 41' according to some specific embodiments, wherein Fig. (a) shows a perspective view of the detector group in an installed state, and Fig. Figure (c) is a perspective view of the detector group in the disassembled state, and Figure (d) is a cross-sectional view of the detector group with the fixing device in the installed state. As shown in FIG. 15 , the first mounting part of the mounting and fixing structure of the detector group 41 ′ includes a sliding block 412 arranged on the detector arm 411 , and the sliding block 412 extends along the length direction of the detector arm 411 , wherein the detector When the group 41 ′ is installed in the radiation scanning device, the length direction of the detector arm 411 is perpendicular to the conveying direction of the object 6 to be detected. In FIG. 15 , the slider 412 extends over a portion of the length of the detector arm 411 , in other embodiments, the slider 412 may be configured to extend over the entire length of the detector arm 411 or other lengths. In addition, the slider 412 may be fixed to the detector arm 411 by bolting or the like. According to other embodiments, the slider 412 can also be integrally formed with the detector arm 411 .

The second mounting portion is formed as a fixed guide rail 413 matched with the slider 412 . The fixed guide rail 413 is fixedly connected to the support frame 5 (not shown in FIG. 15 ) of the radiation scanning device, and can also be integrally formed with the support frame 5 . The length direction of the fixed guide rail 413 is perpendicular to the conveying direction of the detected object 6 of the radiation scanning apparatus. One end of the fixed guide rail 413 along the length direction can be provided with a limiting part (not shown in the figure). When installing the detector group 41 ′, align the slider 412 with the fixed guide rail 413 and push the detector group along the fixed guide rail 413 41' until the detector arm 411 abuts against the limiting portion, thereby moving the detector group 41' to a predetermined installation position.

The fixing device is disposed on one side of the detector group 41' in the width direction, and abuts against the surface 414 of the detector arm 411 on the one side in the width direction. Specifically, the fixing device includes a positioning member 415 and a fastener 416, wherein the positioning member 415 is fixedly connected to the support frame 5, and its end face away from the support frame 5 is formed as a mounting reference surface 417, and the mounting reference surface 417 is used to abut against the support frame 5. A surface 414 against one side of the detector arm 411 in the width direction. The surface 414 is the mounting surface of the detector arm 411, and it and the mounting reference surface 417 are both processed to have good flatness, so that when the mounting surface 414 of the detector arm 411 is fixed against the mounting reference surface 417, it can be Accurately locate the detector group 41'. The fasteners 416 may pass through the positioning member 415 and fasten the detector group 41' relative to the end face of the positioning member 415. Specifically, the fasteners 416 can be, for example, fastening bolts, the positioning member 415 and the detector arm 411 are provided with corresponding threaded holes on the sides opposite to the positioning member 415, and the fastening bolts 416 are passed through the corresponding threaded holes and By tightening, the detector group 41 ′ can be fastened relative to the end face of the positioning member 415 . A plurality of fixing devices, such as at least two, may be provided along the length direction of the detector group 41', so as to firmly fix the detector group 41' on the support frame 5.

Through the above-mentioned installation and fixing structure, when the detector group 41' is installed, in the state where the detector unit of the detector group 41' faces downward, the slider 412 on the detector group 41' is first aligned with the fixed guide rail 413, so that the The detector group 41 ′ moves along the fixed guide rail 413 until it abuts against the limiting portion on the fixed guide rail 413 ; then, the fastening bolts 416 are passed through the positioning member 415 and the corresponding threaded holes on the detector arm 411 and tightened, so that the The detector group 41 ′ is positioned relative to the end surface of the positioning member 415 , that is, the installation reference surface 417 . When disassembling the detector group 41', the reverse operation may be performed.

Since the length direction of the fixed guide rail is perpendicular to the conveying direction of the detected object 6 of the radiation scanning device, and one side of the detector group 41 ′ along the X direction is not obstructed by the radiation source, with the aid of the above-mentioned mounting and fixing structure, the detector The group 41 ′ can be disassembled or installed relative to the support frame 5 perpendicular to the conveying direction of the inspected object 6 of the radiation scanning device. In addition, the fixing device is arranged on one side of the detector group along the width direction, that is, the side of the detector along the Z direction. Therefore, the detector group can be fastened by avoiding the shielding of the ray source, which facilitates the disassembly of the detector group. installation and maintenance.

Furthermore, preferably, in the above-mentioned mounting and fixing structure, the second mounting portion is configured to support the detector group 41' at a predetermined mounting position in a state of being matched with the first mounting portion. Specifically, the sliders 412 are disposed on opposite sides of the detector arm 411 in the width direction, and have inward extensions 4121 , 4122 extending inward from edges of the detector arms 411 on the opposite sides in the width direction (see Figure 15 (b)); the fixed guide rail 413 includes extension parts 4131, 4132 extending outward on opposite sides in the width direction (see Figure 15 (b)); When the guide rails 413 are matched, the inner extension parts 4121 and 4122 of the slider 412 are located above the outer extension parts 4131 and 4132 of the fixed guide rail 413 and are in contact and overlapped. Therefore, after the detector group 41 ′ moves to the predetermined installation position along the fixed guide rail 413 , the detector group 41 ′ can be suspended on the extension parts 4131 and 4132 of the fixed guide rail 413 through the inner extension parts 4121 and 4122 of the slider 412 . . In this way, the fixed guide rail 413 can support the detector group 41 ′ at the predetermined installation position without any additional auxiliary structures or tools, and when the detector group 41 ′ is fastened, the operator does not need to fix the detector. The group 41' can be operated by being supported, thereby improving the convenience of operation.

Similar to the detector group 41', the detector group 43' is disassembled and assembled by a combination of a sliding block and a fixed guide rail. Specifically, Fig. 16 shows a mounting and fixing structure suitable for the detector group 43' according to some specific embodiments, wherein Fig. (a) shows a perspective view of the detector group in an installed state, and Fig. (b) is a detector Side view of the group in the installed state.

As shown in FIG. 16 , the first mounting part of the mounting and fixing structure of the detector group 43 ′ includes a sliding block 432 arranged on the detector arm 431 , and the sliding block 432 extends along the length direction of the detector arm 431 , wherein the detector When the group 43' is installed in the radiation scanning device, the length direction of the detector arm 431 is perpendicular to the conveying direction of the detected object 6 of the radiation scanning device. The sliding block 432 can be fixed to the detector arm 431 by bolting or the like, or can be integrally formed with the detector arm 431 . The detector arm 431 is formed with a groove 433 extending in the length direction, and the slider 432 is disposed in the groove 433 .

The second mounting portion is formed as a fixed guide rail 434 matched with the slider 432 . The fixed guide rail 434 is fixedly connected to the support frame 5 of the radiation scanning device, and can also be integrally formed with the support frame 5 . The length direction of the fixed guide rail 434 is perpendicular to the conveying direction of the detected object 6 . One end of the fixed guide rail 434 along the length direction can be provided with a limiting part (not shown in the figure). When the detector group 43' is installed, the slider 432 is aligned with the fixed guide rail 434, and the detector group is pushed along the fixed guide rail 434. 43' until the detector arm 431 abuts against the limiting portion, thereby moving the detector group 43' to a predetermined installation position.

The fixing device of the mounting and fixing structure of the detector group 43' adopts the same fixing device as that of the detector group 41', and the specific structure of the fixing device is not described in detail here. With this fixing device, the detector group 43' can be fastened and fixed against the corresponding installation reference surface on the support frame 5. The detector arm 431 of the detector group 43' is also provided with a mounting surface on one side in the width direction, and similarly, the mounting surface and the mounting reference surface on the support frame 5 are both processed to have good flatness, When the mounting surface of the detector arm 431 abuts against the mounting reference surface, the detector group 43' can be accurately positioned in the width direction. Likewise, a plurality of fixing devices, such as at least two, may be provided along the length direction of the detector group 43', so as to firmly fix the detector group 43' on the support frame 5.

Through the above-mentioned installation and fixing structure, when the detector group 43' is installed, with the detector unit facing upward, first align the slider 432 on the detector group 43' with the fixed guide rail 434, so that the detector group 43' is aligned along the The fixed guide rail 434 is moved until it abuts against the limiting portion on the fixed guide rail 434; then, the fastening bolts are passed through the corresponding threaded holes on the positioning member and the detector arm and tightened, thereby positioning the detector group 43' relative to the positioning member on the mounting reference surface. When disassembling the detector group 43', the reverse operation may be performed.

Since the length direction of the fixed guide rail is perpendicular to the conveying direction of the detected object 6 of the ray scanning device, and one side of the detector group 43 ′ along the X direction is not obstructed by the radiation source, with the aid of the above-mentioned installation and fixing structure, the detector The group 43 ′ can be disassembled or installed relative to the support frame 5 perpendicular to the conveying direction of the detected objects 6 of the radiation scanning device. In addition, the fixing device is arranged on one side of the detector group 43 ′ along the width direction, that is, the side of the detector along the Z direction. Therefore, the detector group can be fastened by avoiding the shielding of the radiation source, which is convenient for the detector group. disassembly and maintenance.

Furthermore, preferably, in the above-mentioned mounting and fixing structure, the second mounting portion is configured to support the detector group 43' at a predetermined mounting position in a state of being matched with the first mounting portion. Specifically, as shown in FIG. 16 , the fixed guide rail 434 includes supporting parts 4341 and 4342 , which in addition to slidingly matching with the sliding block 432 , also support the sliding block 432 under the sliding block 432 . After the detector group 43 ′ is moved to the predetermined installation position along the fixed guide rail 434 , the detector group 43 ′ is supported at the predetermined installation position from below. In this way, when the detector group 43' is fastened, the detector group 43' can be operated without additional tools and without the operator supporting the detector group 43', thereby improving the convenience of operation.

Fig. 17 shows an installation and fixing structure suitable for the detector group 44' according to some specific embodiments, wherein Fig. (a) shows a perspective view of the detector group in an installed state, and Fig. A schematic diagram of a state in which the installation part and the second installation part are separated. Figures (c) and (d) are perspective views from different perspectives when the first installation part and the second installation part of the installation and fixing structure are in a matched state.

The first mounting portion of the mounting fixing structure of the detector group 44 ′ is specifically formed as a fixing block 442 provided on one side of the detector arm 441 in the width direction, and the fixing block 442 has a thickness direction facing the detector arm 441 . Opening 443 on one side. In the installed state of the detector group 44', the width direction of the detector arm 441 is consistent with the conveying direction of the detected object 6 of the radiation scanning device, and the thickness direction is perpendicular to the conveying direction of the detected object 6. The opening 443 of the fixing block 442 may be U-shaped, or may be other suitable shapes. The fixing block 442 can be fixedly connected to the detector arm 441 by means of bolting or the like, or can be formed integrally with the detector arm 441 .

The second mounting portion is formed as a cantilever portion 444 fixed on the support frame 5 , and an extension portion 445 is provided at the end of the cantilever portion 444 away from the support frame 5 . That is, the extension portion 445 can move from the edge of the opening 443 to the inside of the opening 443 in a straight line. The longitudinal direction of the cantilever portion 444 corresponds to the conveying direction of the object to be detected 6 of the radiation scanning apparatus. The bottom of the opening 443 can be used as a limiting part. When installing the detector group 44 ′, align the opening 443 of the fixing block 442 on the detector arm 441 with the extension 445 and move the detector in a straight line relative to the extension 445 The arm 441 abuts the extension 445 up to the bottom of the opening 443, thereby defining the detector group 44' in the predetermined mounting position.

The fixing device is arranged on one side of the detector arm 441 in the width direction (the same side as the fixing block 442), the end surface of the fixing device is formed as the installation reference surface, and the fixing device fastens the detector arm 441 relative to the installation reference surface . Specifically, the fixing device may include a fixing piece 446 and a fastener 447 , and the end surface of the fixing piece 446 away from the support frame 5 is formed as a mounting reference surface 448 for abutting against one side of the detector arm 441 in the width direction. Surface 449. The surface 449 is the mounting surface of the detector arm 441, and both the mounting surface 448 and the mounting reference surface 448 are processed to have good flatness. Detector set 44' is accurately positioned. Fasteners 447 are used to fasten the probe arm 441 relative to the end face 448 of the fixing member 446 . The fasteners 447 can be fixing bolts, the side of the detector arm 441 opposite to the fixing member 446 in the width direction and the fixing member 446 are formed with corresponding threaded holes, and the fixing bolts 447 can pass through the fixing member 446 and the detector. Corresponding threaded holes on the arms 441 and tightened to secure the detector set 44 ′ relative to the mounting reference surface 448 . In addition, the fixing means may include a plurality, for example at least two, and the plurality of fixing means may be arranged at intervals along the length direction of the detector group 41', so as to firmly fix and position the detector group 44'.

Through the above-mentioned installation and fixing structure, when the detector group 44' is installed, in the state where the detector unit faces the scanning area and the width direction is consistent with the conveying direction of the detected object 6, the fixing block 442 on the detector group 44' is first installed. The opening 443 of the cantilever portion 444 is aligned with the extension portion 445 of the cantilever portion 444, and the detector group 44' is moved along the extension portion 445 until the bottom of the opening 443 abuts the extension portion 445; The corresponding threaded holes on the detector arm 441 are tightened, so that the detector group 44 ′ is positioned relative to the installation reference surface 448 of the fixing member 446 . When disassembling the detector group 44', the reverse operation may be performed.

Therefore, with the above-mentioned mounting and fixing structure, since the cantilever portion 444 extends along the conveying direction of the detected object 6 in the radiation scanning device, the width direction of the detector group 44 ′ is parallel to the conveying direction of the detected object 6 , and the fixing block 442 The opening 443 faces one side of the detector group 44 ′ in the thickness direction. By making the detector crystals face the scanning area, the detector group 44 ′ can be installed or removed along the conveying direction perpendicular to the detected object 6 .

Furthermore, preferably, in the above-mentioned mounting and fixing structure, the second mounting portion is configured to support the detector group 44' at a predetermined mounting position in a state of being matched with the first mounting portion. That is, after the cantilever portion 444 moves to a predetermined installation position relative to the extension portion 445 of the cantilever portion 444, the entire detector group 44' can be supported by the fixing block 442 without other auxiliary structures or tools. In this way, when the detector group 44' is fastened, the detector group 44' can be operated without additional tools and without the operator supporting the detector group 44', thereby improving the convenience of operation.

Although each detector group 41', 42', 43', 44' is disassembled or installed relative to the support frame 5 using different fixed installation structures, each detector group can still be perpendicular to other detector groups after installation. In the same plane of the conveying direction of the detected object 6 . Specifically, setting the installation reference plane of each detector group in the same plane perpendicular to the conveying direction of the detected object 6 can ensure that each detector group 41 ′, 42 ′, 43 ′, 44 ′ is located in the same position after being installed in place In the same plane that is perpendicular to the conveying direction of the detected object 6 .

In addition, the linear movement coordination between the first mounting portion and the second mounting portion of the fixed mounting structure in FIGS. 15-16 adopts slider guide rail coordination. According to other embodiments, the fixed mounting structure of the present application may also adopt other straight lines. Moving fits, such as linear sliding or linear rolling fits, such as linear ball bearings and cylindrical shafts, etc.

The installation and fixing structure of the detector group of the detector 4 of the radiation scanning apparatus of the present embodiment is described above. The following continues to describe the features of other aspects of the radiation scanning device of this embodiment.

The relative arrangement of the radiation source 3 and the detector 4 of the radiation scanning device of this embodiment is basically the same as that of the previous embodiment. As in the previous embodiment, the radiation source 3 includes a plurality of radiation source modules, each of which is arranged around the scanning area and is located in a plane perpendicular to the conveying direction of the detected object 6, especially in the same plane; the detector 4 includes A plurality of detector groups, the plurality of detector groups are located in other planes perpendicular to the conveying direction of the detected objects 6, especially in the same plane, and the ends of the respective detector groups are connected to each other to be arranged around the scanning area, and further In the combined state of the radiation source 3 and the detector 4, the detector 4 is arranged inside the radiation source 3 along the vertical direction of the conveying direction of the detected object 6, and the radiation source 3 and the detector 4 are arranged so that the detected object 6 is located on the inner side of the radiation source 3. 6 at least partially overlap in the conveying direction, wherein the plurality of detector groups of the detector 4 may be any of the closed square structures, rectangular structures, polygonal structures or elliptical structures surrounding the scanning area described in the foregoing embodiments. Structure: Different from the previous embodiment, the multiple ray source modules of the ray source 3 are arranged in a non-closed structure with an opening on the left side of the scanning area surrounding the scanning area, such as a rectangular structure, a polygonal structure, and an elliptical structure with an opening on the left side. etc., as any of the structures described above in this embodiment.

Similar to the previous embodiments, each detector group of the detector 4 in this embodiment is preferably arranged so as not to block the ray beams of the ray source modules on the same side, while being able to receive rays from the ray source modules on the other sides. Since both the ray source 3 and the detector 4 are arranged in a ring shape (wherein the ray source 3 is a semi-closed ring with an opening on the left side), the same detector group can be shared by different ray source modules of the ray source. In addition, the rays of each ray source module of the ray source 3 can be detected not only by the detector groups on the opposite side, but also by the detector groups on other sides. Therefore, the rays of each ray source module can be detected by as many as possible. detector detected. Therefore, the detector of this embodiment can also reduce the number of detector groups and reduce equipment cost while improving image quality.

In addition, as in the previous embodiment, preferably, the detector crystals of the respective detector groups of the detector 4 are arranged at the ends of the detector unit along the conveying direction of the detected object 6 , and arranged so as to be at the edge of the detected object 6 . It is close to the edge of the ray beam of the ray source module on the same side in the conveying direction, but does not block the ray beam of the ray source module on the same side. Therefore, the coverage length of the optical path between the radiation source and the detector can be reduced as much as possible, thereby reducing the length of the device.

In addition, as in the previous embodiment, more preferably, each ray source module of the ray source 3 is arranged so that the ray beam avoids the detector group on the same side and illuminates the detector crystals of the detector group on the opposite side. Specifically, as in the previous embodiment, the ray source module can be rotated relative to the target axis by a predetermined angle to adjust the beam exit angle of the ray beam of the ray source module, so that the center position of the ray beam illuminates the detector crystal. Since the detector crystal of the detector is located at the end position of the detector unit in the conveying direction of the detected object 6 and is arranged close to the beam edge of the radiation source on the same side, the radiation source module can only be rotated by a very small predetermined angle, for example, it can be is 1.5 degrees, so that the center position of the ray beam illuminates the detector crystal. In this way, the adverse effect of the ray beam obliquely incident on the detector crystal surface on imaging can be minimized. Similar to the foregoing embodiments, the radiation source module can be rotated around the target axis or other axes, or the beam exit angle of the radiation beam can be adjusted by other suitable methods mentioned in the foregoing embodiments.

In addition, as in the previous embodiment, the end of the adjacent ray source modules of the ray source in this embodiment also lacks projection data, so the image processing module of the ray scanning device in this embodiment is also configured to have a data compensation function, It can compensate for missing perspective data and/or inpaint the reconstructed image to improve image quality. The image processing module of the ray scanning device of this embodiment uses the same method as the previous embodiment to perform image reconstruction.

In addition to having the same advantages as the radiation scanning device of the previous embodiment, the radiation scanning device of this embodiment has the following advantages.

The radiation scanning device of this embodiment is particularly suitable for use in the security inspection of hand luggage at the airport. Airport hand luggage has the characteristics of small size (for example, usually within 600mm*400mm), large length, width and small thickness, and when it is placed on the conveyor for inspection, the thickness is usually along the up and down direction, the width is along the left and right direction, and the length is along the vertical direction. conveying direction. However, in the radiation scanning device of this embodiment, radiation source modules are arranged on the upper and lower sides of the scanning area to scan the luggage in the thickness direction. In this way, more projection data can be obtained in the thickness direction with a smaller size. In addition, due to the small thickness of the luggage, the projection data in the thickness direction is less affected by self-occlusion and ray attenuation. Therefore, the projection data in the thickness direction is more accurate and clearer than other directions, which is conducive to improving image quality. At the same time, the ray source of the ray scanning device of the present invention is only provided with a ray source module on one side in the width direction of the luggage. In the width direction, the projection data is greatly affected by the self-occlusion and ray attenuation of the luggage items, so the projection data The quality of the projection data in the thickness direction is worse than that of the projection data in the thickness direction. Setting the ray source module on only one side in the width direction of the luggage can reduce the cost of the ray source while ensuring the image quality.

In addition, although the radiation scanning device of this embodiment does not have a radiation source on the left side of the scanning area, it is still provided with a right detector group opposite to the left side of the scanning area, and the right detector group can receive the upper and lower sides. For the rays of the ray source module, the corresponding detection data of the rays of the ray source modules on the upper and lower sides are added. Therefore, the image quality can be improved compared to the case where the detector group is only provided on the opposite side of each ray source module.

In addition, this embodiment is described by taking as an example that the multiple ray source modules of the ray source are arranged in the same plane perpendicular to the conveying direction of the object to be detected, but the same applies to the fact that the multiple ray source modules of the ray source are arranged in the same plane perpendicular to the conveying direction of the detected object. The situation in different planes of the conveying direction of the detected object.

In addition, the embodiment has been described by taking as an example that the plurality of detector groups of the detector are arranged in the same plane of the conveying direction of the detected object, but the same applies to the plurality of detector groups of the detector being arranged perpendicular to the detected object. situation in different planes of the conveying direction.

In the foregoing embodiments, a ray scanning device is described in which the ray source surrounds the scanning area on the upper, lower, left, right, and four sides. According to other embodiments, the present application also provides a ray scanning device, the arrangement of which is basically the same as that of the ray scanning device in the previous embodiment, the difference mainly lies in the arrangement of the ray source, wherein in this embodiment, the ray source is only on the upper The side, left and right sides surround the scanning area, that is, the radiation source only surrounds the scanning area above the conveying device, and no radiation source module is provided below the conveying device (for details, please refer to FIG. Schematic diagram of the layout of the ray source and detector in this embodiment). Here, the upper part of the conveying device includes not only the right above the conveying device, but also the upper side of the conveying device; in addition, the upper part of the conveying device is not strictly limited to be higher than the conveying device in height, and it is approximately the same as the conveying device in height. , or a case slightly lower than the conveyor is also included in the scope of this embodiment.

Specifically, in the ray scanning device of the aforementioned embodiment, each ray source module of the ray source 3 is a distributed multi-point source, and the plurality of ray source modules can be arranged in a rectangular structure, a polygonal structure, or an elliptical structure surrounding the scanning area. Wait. In this embodiment, the multiple ray source modules of the ray source can still be distributed multi-point sources, the difference is that the multiple ray source modules are arranged in a non-closed structure that surrounds the scanning area and opens below the conveying device, for example, in the conveying area. Rectangular structures, polygonal structures, elliptical structures, etc. with openings under the device. In the aforementioned embodiment, the ray source 3 has a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygonal or discontinuous rounded rectangular structure, and other polygonal and elliptical structures. Arrangement, while in this embodiment, the radiation source is in a discontinuous or continuous rectangular structure, a continuous polygonal structure, a continuous rounded rectangle, a discontinuous polygon or a discontinuous rounded rectangular structure opening below the conveying device and other polygonal and elliptical structural arrangements, for example, with respect to the ray source shown in FIG. 2 , the ray source 3 in this embodiment at least does not include the ray source module 33 below, and in some cases does not include the ray source module 32, 34 is lower than the part of the conveying device 1; for example, in contrast to the radiation sources shown in (b)-(c) in FIG.

In addition, the same as the previous embodiment, the ray source in this embodiment can also be composed of multiple single-point source groups, the only difference is that the ray source 3 in this embodiment does not include the bottom viewing angle, the lower left oblique viewing angle and the lower right oblique viewing angle. single point source.

Except for the above differences, other aspects of the features of the radiation source in this embodiment are the same as the radiation source 3 in the previous embodiment.

The features of the various aspects of the detector of this embodiment are basically the same as the detector 4 in this previous embodiment, except that in this embodiment, the detector is not surrounded by only the upper, left and right sides For the combination of radiation sources in the scanning area, there is no radiation source module on the same side of the detector group of detector 4 that is located below the scanning area, and the disassembly and installation of the detector group of detector 4 located below the scanning area will not be affected by the lower side radiation Blockage of source modules. Therefore, except that each detector group of the detector can be disassembled and assembled by using the same mounting and fixing structure as the aforementioned embodiment, the detector group located under the scanning area is not obstructed by the left or right ray source modules. , can also be disassembled or installed relative to the support frame 5 along the direction perpendicular to the conveying direction of the detected object 6 , specifically, the disassembly and assembly can be carried out by using the installation and fixing structure described above with reference to FIG. 16 .

In addition, the relative arrangement of the radiation source 3 and the detector 4 of the radiation scanning apparatus of this embodiment is basically the same as that of the previous embodiment. Specifically, as in the foregoing embodiment, the ray source 3 includes a plurality of ray source modules, each of which is arranged around the scanning area, and is located in a plane perpendicular to the conveying direction of the detected object 6, especially in the same plane; The detector 4 includes a plurality of detector groups, and the plurality of detector groups are located in other planes perpendicular to the conveying direction of the detected object 6, especially in the same plane, and the ends of each detector group are connected to each other to surround the scanning area Arrangement, and further, in the combined state of the radiation source 3 and the detector 4, the detector 4 is arranged on the inner side of the radiation source 3 along the vertical direction of the conveying direction of the detected object 6, and the radiation source 3 and the detector 4 are The detection object 6 is at least partially overlapped in the conveying direction, wherein the plurality of detector groups of the detector 4 may be any of the closed square structures, rectangular structures, polygonal structures or elliptical structures surrounding the scanning area described in the foregoing embodiments. A structure; different from the previous embodiment, the plurality of radiation source modules of the radiation source 3 are arranged in a non-closed structure with an opening under the conveying device surrounding the scanning area, such as a rectangular structure, a polygonal structure, an ellipse opening under the conveying device shape structure, etc., such as any of the structures described above in this embodiment.

Similar to the previous embodiments, each detector group of the detector 4 in this embodiment is preferably arranged so as not to block the ray beams of the ray source modules on the same side, while being able to receive rays from the ray source modules on the other sides. Since both the ray source 3 and the detector 4 are arranged in a ring shape (wherein the ray source 3 is a semi-closed ring with a lower opening), the same detector group can be shared by different ray source modules of the ray source. In addition, the rays of each ray source module of the ray source 3 can be detected not only by the detector group on the opposite side, but also by other side detector groups. Therefore, the rays of each ray source module can be detected as much as possible. device detected. Therefore, the detector of this embodiment can also reduce the number of detector groups and reduce equipment cost while improving image quality.

In addition, as in the previous embodiment, preferably, the detector crystals of the respective detector groups of the detector 4 are arranged at the ends of the detector unit along the conveying direction of the detected object 6 , and arranged so as to be at the edge of the detected object 6 . It is close to the edge of the ray beam of the ray source module on the same side in the conveying direction, but does not block the ray beam of the ray source module on the same side. Therefore, the coverage length of the optical path between the radiation source and the detector can be reduced as much as possible, thereby reducing the length of the device.

In addition, as in the previous embodiment, more preferably, each ray source module of the ray source 3 is arranged so that the ray beam avoids the detector group on the same side and illuminates the detector crystals of the detector group on the opposite side. Specifically, as in the previous embodiment, the ray source module can be rotated relative to the target axis by a predetermined angle to adjust the beam exit angle of the ray beam of the ray source module, so that the center position of the ray beam illuminates the detector crystal. Since the detector crystal of the detector is located at the end position of the detector unit in the conveying direction of the detected object 6 and is arranged close to the beam edge of the radiation source on the same side, the radiation source module can only be rotated by a very small predetermined angle, for example, it can be is 1.5 degrees, so that the center position of the ray beam illuminates the detector crystal. In this way, the adverse effect of the ray beam obliquely incident on the detector crystal surface on imaging can be minimized. Similar to the foregoing embodiments, the radiation source module can be rotated around the target axis or other axes, or the beam exit angle of the radiation beam can be adjusted by other suitable methods mentioned in the foregoing embodiments.

In addition, as in the previous embodiment, the end of the adjacent ray source modules of the ray source in this embodiment also lacks projection data, so the image processing module of the ray scanning device in this embodiment is also configured to have a data compensation function, It can compensate for missing perspective data and/or inpaint the reconstructed image to improve image quality. The image processing module of the ray scanning device of this embodiment uses the same method as the previous embodiment to perform image reconstruction.

In addition to having the same advantages as the radiation scanning device of the previous embodiment, the radiation scanning device of this embodiment has the following advantages.

In the radiation scanning apparatus of this embodiment, no radiation source modules are arranged under the conveying device, so the height of the conveying device can be reduced to facilitate the transportation of the detected items to the conveying device; In this embodiment, the equipment cost can be saved.

In addition, although the ray scanning device of this embodiment does not have a lower ray source, it still has an upper detector group opposite to the lower position. Corresponding detection data of rays of the side ray source module. Therefore, the image quality can be improved compared to the case where the detector group is only provided on the opposite side of each ray source module.

In addition, this embodiment is described by taking as an example that the multiple ray source modules of the ray source are arranged in the same plane perpendicular to the conveying direction of the object to be detected, but the same applies to the fact that the multiple ray source modules of the ray source are arranged in the same plane perpendicular to the conveying direction of the detected object. The situation in different planes of the conveying direction of the detected object.

In addition, the embodiment has been described by taking as an example that the plurality of detector groups of the detector are arranged in the same plane of the conveying direction of the detected object, but the same applies to the plurality of detector groups of the detector being arranged perpendicular to the detected object. situation in different planes of the conveying direction.

In the foregoing embodiments, a ray scanning device is described in which the ray source and the detector surround the scanning area on four sides of the upper, lower, left and right sides. According to other embodiments, the present application also provides a ray scanning device, which is basically the same in structure as the ray scanning device in the foregoing embodiment, and only differs in the arrangement of the ray source and the detector. The specific differences are as follows: In this embodiment, viewed from the conveying direction of the object to be detected, the multiple ray source modules of the ray source are arranged around the scanning area in a non-closed structure with an opening on one side of the scanning area, and the multiple ray source modules of the detector The detector group is also arranged around the scanning area with a non-closed structure opened on one side of the scanning area, and the opening of the non-closed structure of the detector is opposite to the opening of the non-closed structure of the radiation source; The device group is fixed in the same plane perpendicular to the conveying direction of the detected object, and the multiple radiation source modules of the radiation source are fixed in multiple different planes perpendicular to the conveying direction of the detected object. The ray source module on the opening side of the non-enclosed structure of the detector and each detector group of the detector are fixed in the same plane perpendicular to the conveying direction of the detected object, and the other ray source modules of the ray source are fixed in the same plane perpendicular to the object being detected. Detect objects within other planes of the conveying direction.

The structure and arrangement of the radiation source of the radiation scanning apparatus according to the present embodiment will be described in detail below.

Similar to the aforementioned embodiments, the ray source of the ray scanning device in this embodiment includes a plurality of ray source modules, and each ray source module may be a distributed multi-point source. As a distributed multi-point source, each ray source module can have multiple target points, each target point of each ray source module can generate a ray beam independently, and each target point can be generated according to a predetermined sequence under the control of the control device beam of rays. The ray beam may be a fan beam with an opening angle A, as shown in FIG. 3 . Of course, the shape of the ray beam is not limited to a fan beam, and may also be a ray beam of other shapes such as a cone beam, a parallel beam, etc., which can be specifically set as required.

In the aforementioned embodiment, when viewed along the conveying direction of the detected object, the multiple radiation source modules of the radiation source surround the scanning area on four sides, while in this embodiment, when viewed along the conveying direction of the detected object, the ray source The multiple ray source modules of the source are arranged around the scanning area on only three sides, ie, around the scanning area in a non-enclosed structure open on one side of the scanning area. Specifically, as shown in FIGS. 19-21 (FIG. 19 is a schematic perspective view of the layout of the ray source and detector of the ray scanning device according to the present embodiment, and FIG. 20 is the layout of the ray source and detector shown in FIG. Figure 21 is a schematic top view of the layout of the radiation source and detector shown in Figure 19, in which the radiation source modules on the left and right sides of the scanning area are arranged perpendicular to the transport of the detected object. The ray source module below the scanning area is arranged in another plane perpendicular to the conveying direction of the detected object (as shown by the dotted line ray in Figure 21) The exit position is shown)), viewed from the conveying direction of the detected object, the ray source 3 includes ray source modules 31, 32, 33 arranged on the left, right and lower sides of the scanning area, respectively. The ray source modules 31, 32 , 33 form a non-closed structure surrounding the scanning area opened on the upper side of the scanning area. In the illustrated embodiment, the ray source module is a linear distributed multi-point source, and the non-closed structure of the ray source is a right-angled rectangular structure with an opening on the upper side of the scanning area. The ray source modules 31 , 32 , and 33 of the ray source 3 are not limited to linear distributed multi-point sources, and may also be arc-shaped, polyline-shaped, or the like according to other embodiments. Linear, arc-shaped or polyline-shaped ray source modules can be set or combined as required, so that when viewed from the conveying direction of the detected object, the ray source 3 can have a rounded rectangular structure surrounding the scanning area with an opening on the upper side of the scanning area, Polygonal structure, elliptical structure, etc. In addition, viewed along the conveying direction of the detected object, the radiation source modules of the radiation source 3 are not limited to being arranged on the left, right and lower sides of the scanning area, and can also be arranged, for example, on the upper, left and right sides, The upper and lower sides and the left side, as well as the upper and lower sides and the right side, can be set according to the actual use scene. In the following description of this embodiment, the case where the ray source modules are arranged on the left side, the right side and the lower side of the scanning area is taken as an example for description, but the described principles are also applicable to the ray source modules arranged on any other three sides. Case.

Similar to the aforementioned embodiments, the multiple ray source modules of the ray source in this embodiment can also be disassembled and installed independently of each other, that is, each ray source module has a separate cavity for accommodating its own ray generating device , each ray source module has a separate cavity, which means that multiple targets of each ray source module share a separate vacuum cavity. The distance between the multiple targets of each ray source module in the vacuum chamber can be determined by the number of targets and the length of the chamber. According to some embodiments, the number of targets in a single radiation source module may be 192, 264, etc., and the distance between targets in a single radiation source module may be 4 mm, 12 mm, and the like. Each ray source module has a separate cavity, which has the following advantages: Compared with the ray source with an integral annular cavity (that is, all targets of the ray source are located in the same annular vacuum cavity), the size of a single ray source module can be reduced. The size of the housing and the volume of the internal vacuum cavity reduce the volume and weight of a single ray source module, thus facilitating the disassembly and installation of the ray source; in addition, each ray source module adopts a separate vacuum cavity, which can reduce the need for radiation Risk of fire in the cavity when the module is being serviced.

Further, as in the aforementioned embodiments, each ray source module of the ray source 3 is provided with an installation and positioning structure, so as to facilitate the installation and adjustment of the ray source modules. By means of the mounting and positioning structure, each radiation source module of the radiation source 3 can be mounted and fixed at a predetermined position in the radiation scanning device. In addition, by means of the installation and positioning structure, the radiation source module can also be rotated to adjust the beam exit angle of the radiation beam. Each ray source module of the ray source 3 may adopt different installation methods due to different positions in the ray scanning device, and have different installation and positioning structures. For example, the ray source modules located on the left and right sides of the scanning area can be installed by means of hoisting through equipment such as overhead cranes. The installation and positioning structures described in the embodiments (such as the installation and positioning structures shown in FIG. 5 , etc.) are installed to fix or adjust the beam exit angle of the ray beam.

In addition, similar to the aforementioned embodiments, the ray source 3 may also be composed of multiple single point sources, each ray source module may be a single point source group, and each single point source group includes at least two single point sources. Each single point source may individually emit a beam of rays, such as a fan beam with an opening angle A (as shown in Figure 3). Each single point source of the radiation source 3 can emit radiation according to a predetermined sequence under the control of the control device of the radiation scanning system. In the case where each ray source module is a single-point source group, viewed from the conveying direction of the detected object 6, the single-point source group is distributed at least at the bottom viewing angle, left viewing angle and right viewing angle, and can be further distributed at corner oblique viewing angles. , such as the lower left oblique view and the lower right oblique view, and even further including the upper left and upper right oblique views (as shown in FIG. 22 ).

Next, the arrangement of the detector 4 of the radiation scanning apparatus of the present embodiment is described in detail. Like the aforementioned embodiments, the detector 4 may comprise a plurality of detector groups, and the plurality of detector groups are preferably located in the same plane perpendicular to the conveying direction of the detected object 6 . In addition, like the aforementioned embodiments, the detector group of this embodiment is also a detector array including a plurality of detector units.

In addition, in the aforementioned embodiment, viewed along the conveying direction of the detected object, the plurality of detector groups of the detector 4 are arranged around the scanning area on four sides, forming a closed structure surrounding the scanning area, while in this embodiment Among them, viewed along the conveying direction of the detected object, the detector groups of the detector 4 are arranged around the scanning area only on three sides, that is, arranged around the scanning area in a non-closed structure open on one side of the scanning area. Specifically, as shown in FIGS. 19-21 , the detector 4 includes detector groups 41 , 42 , and 43 arranged on the left, right, and upper sides of the scanning area, respectively. The ends of the detector groups 41 , 42 , and 43 are mutually The connection forms a non-enclosed structure surrounding the scan area that is open on the underside of the scan area. In the embodiment shown in FIGS. 19-21 , the detector groups 41 , 42 , and 43 are linear detector arrays including a plurality of detector units arranged in a straight line, thereby forming a non-closed rectangle opened on the lower side of the scanning area or square structure. However, the detector 4 of this embodiment is not limited to the above-mentioned structure, and can also be arranged in other structures. For example, the detector 4 may include 3 longer linear detector arrays and 2 shorter linear detector arrays, these detector arrays are alternately arranged around the scanning area and the ends are connected to each other to form an opening on the lower side of the scanning area The non-closed polygonal structure (as shown in Figure 23). In addition, the detector 4 may also include other numbers of multiple longer linear detector arrays and other numbers of multiple shorter linear detector arrays, which are alternately arranged around the scanning area and connected at their ends to Other non-closed polygonal structures that are opened on the lower side of the scanning area are formed. The detector group of the detector 4 in this embodiment may also be an arc-shaped detector array, and a plurality of arc-shaped detector arrays are arranged around the scanning area and the ends are connected to each other to form a non-closed ellipse opening on the lower side of the scanning area structure. The detector group of the detector 4 in this embodiment can also be a combination of a linear detector array and an arc-shaped detector array, so as to form other shapes of non-closed structures with openings on the lower side of the scanning area, such as openings on the lower side of the scanning area The rounded rectangular structure, etc. Here, the structure of the detector unit and the structures of the detector groups in the form of a linear detector array and an arc-shaped detector array are exactly the same as those described in the foregoing embodiment.

In addition, the detector groups of the detector 4 are not limited to being arranged on the left, right and upper sides of the scanning area as shown in FIGS. 19-21 , and may also be arranged, for example, on the lower side, the left side and the right side, the upper and lower sides The side and the left side, and the upper and lower sides and the right side, as long as the opening of the non-closed structure of the radiation source can be made to be opposite to the opening of the non-closed structure of the radiation source. In this embodiment, the case where the detector groups shown in FIGS. 19-21 are arranged on the left, right and upper sides of the scanning area is taken as an example for description, but this embodiment is also applicable to the case where the detector groups are arranged in other on any three sides.

Furthermore, as in the foregoing embodiments, in some embodiments, each detector group of the detector 4 is independently removable and installable, thereby improving the maintainability of the detector. Also, as in the aforementioned embodiment, the plurality of detector groups of the detector 4 of the present embodiment are configured to move along the conveying direction of the detected object 6 for disassembly and installation, so that when the detector groups of the detector 4 are perpendicular to When the conveying direction of the detected object 6 is arranged inside the radiation source 3, the detector group can be disassembled, adjusted and maintained without disassembling the radiation source, which further improves the maintainability of the detector. For the detector 4 shown in Figures 19-21, the detector groups 41, 42, 43 can be moved along the conveying direction parallel to the detected object 6 to be disassembled and installed, so that the radiation source modules 31, 32, 33 for disassembly, adjustment and maintenance. The detector groups 41 , 42 , and 43 of the detector 4 can adopt the same mounting and fixing structure as described in the aforementioned embodiments (the embodiment shown in FIG. 9 and its modifications, etc.) relative to its ray scanning. The installation position in the apparatus is moved in the conveying direction of the detected object 6 to be removed from or installed to the installation position. For example, the detector groups 41 , 42 , 43 can be mounted to or detached from the support frame 5 of the radiation scanning apparatus via detector arms, similar to the aforementioned embodiments.

In addition, when the opening of the non-enclosed structure of the radiation source or detector faces the left or right side of the scanning area, the detector group of the detector 4 can also be moved in the vertical direction of the conveying direction of the detected object to disassemble and disassemble Install. As shown in FIG. 24 , when viewed along the conveying direction of the detected object, the openings of the non-closed structures of the radiation source modules 31 , 32 , and 33 of the radiation source face the left side of the scanning area, and the detector groups 41 , 42 , The opening of the non-closed structure of 43 faces the right side of the scanning area. In this case, the detector groups 41, 42, 43 can be moved relative to the installation position (such as the support frame 5) in a direction perpendicular to the conveying direction of the detected object to be disassembled or installed, and the specific movement direction is shown in Fig. 24(b) ) shown by the arrows in the figure. Since the ray source module is not provided on the left side of the scanning area, the ray source does not hinder the above-mentioned movement of the detector, and the detector group can be easily disassembled. The mounting and fixing structure described above that is suitable for disassembling and assembling the detector group along the vertical direction of the conveying direction of the object to be detected can be used, such as the mounting and fixing structure described with reference to FIGS. 15-17 and its modifications, etc. Way.

In addition, the detector group of the detector 4 can also be configured to move part along the conveying direction of the detected object for disassembly and installation, and another part moves along the vertical direction of the conveyed direction of the inspected object for disassembly and installation. For example, in the embodiment shown in FIGS. 19-21 , if the highest point of the ray source modules 31 and 32 on the left or right side of the scanning area is lower than the detector group 41 above the scanning area, the detector group 41 can also be Move in the vertical direction of the conveying direction of the detected object for disassembly and installation. The specific mounting and fixing structure may adopt the embodiment shown in FIG. 15 and its modification. Similarly, if the detector groups of the detector 4 are arranged on the left, right and lower sides of the scanning area, and the detector groups on the lower side are lower than the lowest points of the left and right ray source modules, the detectors on the lower side are The group can also be moved in a direction perpendicular to the conveying direction of the detected object for disassembly and installation. The specific mounting and fixing structure may adopt the embodiment shown in FIG. 16 and its modification.

Furthermore, as in the aforementioned embodiments, the plurality of detector groups of the detectors are mounted in the same plane by means of their respective mounting surfaces and corresponding mounting reference planes (disposed in the same plane perpendicular to the conveying direction of the detected objects 6 ). Then it is in the same plane perpendicular to the conveying direction of the detected object 6 .

Next, the relative arrangement of the radiation source 3 and the detector 4 of the radiation scanning apparatus according to the present embodiment is further described. The relative arrangement of the radiation source 3 and the detector 4 in this embodiment is different from that in the previous embodiments. In this embodiment, in the combined state of the radiation source and the detector, the opening of the non-closed structure of the radiation source is arranged opposite to the opening of the non-closed structure of the detector, and the plurality of detector groups of the detector are fixed in a direction perpendicular to the The detection object is in the same plane of the conveying direction, and the multiple radiation source modules of the radiation source are arranged in multiple planes perpendicular to the conveying direction of the detected object, for example, the radiation source is arranged at the opening of the non-enclosed structure of the detector The ray source module on one side and each detector group of the detector are fixed in the same plane perpendicular to the conveying direction of the detected object, while the other ray source modules of the ray source are fixed in other planes perpendicular to the conveying direction of the detected object Inside. Other ray source modules of the ray source may be located in other single planes perpendicular to the conveying direction of the detected object or in other multiple different planes, preferably in other single planes. In this embodiment, other ray source modules are arranged perpendicular to The conveying direction of the detected object is described in another single plane (as shown in Figure 21) as an example, but it is also applicable to the situation of other multiple different planes.

In the combined state of the radiation source and the detector, the radiation source can be any of the structures described above, such as a rectangular, polygonal, or elliptical structure that is open on one side of the scanning area when viewed along the conveying direction of the detected object. , the detector can be the structure of any of the above-mentioned embodiments, such as a square structure, a rectangular structure, a polygonal structure, an elliptical structure, etc. with an opening on one side of the scanning area, as long as the openings of the radiation source and the detector structure are relatively arranged . In the following, the detailed arrangement of the radiation source 3 and the detector 4 in the combined state will be described by taking the embodiment shown in FIGS. 19-21 as an example, but the same principle is also applicable to the combination of any other structure of the radiation source 3 and the detector 4 .

In particular, similar to the aforementioned embodiments, based on the combination of the radiation source 3 and the detector 4 as described above, in view of the annular arrangement (semi-closed ring) of the detectors, the detector groups 41 , 42 of the detector 4 , 43 can be respectively arranged to be able to receive rays from the respective ray source modules on the remaining sides, so that the multiple ray source modules of the ray source can share the respective detector groups of the detectors. Thereby, the number of detector groups can be reduced. In addition, since the rays of the radiation source modules 31 and 32 can be detected by the detector groups 42 and 41 on the opposite side respectively, they can also be received by other side detector groups except the detectors on the same side. The radiation source module 33 The rays of the ray can be received by all the detector groups 41 , 42 and 43 , therefore, the rays of each ray source module can be detected by the detectors as much as possible. As a result, although the radiation source modules and detectors are only arranged on three sides of the scanning area, the radiation scanning device of this embodiment can still obtain enough detection data for image reconstruction, and at the same time, due to the reduction of the radiation source modules and detectors It can reduce the weight of the equipment, thereby facilitating the construction of a lightweight ray scanning equipment.

Furthermore, in particular, the radiation source modules 33 of the radiation source 3 are arranged in the same plane as the respective detector groups 41 , 42 , 43 of the detectors 4 which are perpendicular to the conveying direction of the detected objects. This specifically means that the ray outlet of the ray source module 33 is facing the detector crystal of each detector group (as shown in FIG. 21 ). Therefore, the ray beam of the ray source module 33 can cover more detector crystals, which is beneficial to obtain more detection data and improve the image quality.

In addition, in particular, similar to the respective detector groups in the foregoing embodiments, viewed from the conveying direction of the detected object, that is, in the vertical direction of the conveying direction of the detected object, the detector 4 and other radiation source modules The detector groups 41 and 42 on the same side of 31 and 32 are respectively arranged between the other ray source modules 31 and 32 of the ray source 3 and the scanning area, and along the conveying direction of the detected object, the other ray source modules 31 and 32 and the same The detector groups 41, 42 on the side overlap at least partially (as shown in Figure 21). Therefore, the length of the device covered by the optical path between the radiation source and the detector can be reduced, thereby reducing the overall length of the device.

In addition, similar to the respective detector groups in the aforementioned embodiments, in the case where the detector groups 41 and 42 at least partially overlap with the radiation source modules 31 and 32 in the conveying direction of the detected object, the detector group 41 , 42 are configured to avoid the ray beams of the ipsilateral ray source modules 31 , 32 , respectively, and receive the rays of all other side ray source modules except the ipsilateral ray source module.

Further, similar to the aforementioned embodiments, the detector crystals of each detector group of the detector 4 are arranged at the ends of the detector unit along the conveying direction of the detected object, and the detector 4 is connected to other radiation sources. The detector groups 41 and 42 on the same side of the modules 31 and 32 are arranged to be close to the ray beam edges of the ray source modules 31 and 32 on the same side respectively in the conveying direction of the detected object, but do not block the ray beams of the ray source modules 31 and 32 on the same side. beam of rays. Therefore, the radiation source 3 and the detector 4 can overlap in the conveying direction of the detected object 6 to the greatest extent, so that the length of the equipment covered by the optical path between the radiation source and the detector can be reduced as much as possible, thereby reducing the The overall length of the small device.

More particularly, similar to the aforementioned embodiments, the radiation source modules 31, 32 of the radiation source 3 are arranged so that the radiation beams avoid the detector groups 41, 42 on the same side respectively and illuminate the detector crystals of the detector groups on the opposite side. Further, as in the aforementioned embodiments, the ray source modules 31 and 32 can be rotated by a predetermined angle relative to the respective target axes to adjust the beam exit angles of the respective ray beams, so that the center positions of the respective ray beams are irradiated relative to each other. side detector crystal. Since the detector crystal of the detector is located at the end position of the detector unit in the conveying direction of the detected object and is arranged close to the beam edge of the ray source on the same side, the ray source module can only be rotated by a very small predetermined angle, for example, it can be 1.5 degrees, so that the center of the beam can illuminate the detector crystal. In this way, the adverse effect of the ray beam obliquely incident on the detector crystal surface on imaging can be minimized. In addition, similar to the foregoing embodiments, the radiation source module can be rotated around the target axis or other axes, or the beam exit angle of the radiation beams can be adjusted by other suitable methods mentioned in the foregoing embodiments.

In addition, similar to the aforementioned embodiments, projection data may also be lacking at the ends of adjacent ray source modules of the ray source of this embodiment. For example, in the embodiment shown in FIGS. 19-21 , the distances between the target points at the adjacent ends of the radiation source modules 31 and 33 and the adjacent ends of the radiation source modules 33 and 32 may be greater than each The spacing between target points within a ray source, therefore, lack of projection data at these ends. Therefore, similar to the aforementioned embodiments, the image processing module of the ray scanning device of this embodiment is also configured to have a data compensation function, which can compensate for missing viewing angle data and/or repair the reconstructed image, so as to improve the image quality. The image processing module of the ray scanning device of this embodiment uses the same method as the previous embodiment to perform image reconstruction.

Of course, according to other embodiments, since the ray source modules 31 and 32 and the ray source module 33 are arranged in different planes perpendicular to the conveying direction of the detected object, the adjacent ends and/or the adjacent ends of the ray source modules 31 and 33 may be specially arranged. Or the adjacent ends of the radiation source modules 33, 32 are arranged to overlap along the conveying direction of the detected object, so that the target points at the adjacent ends of the adjacent radiation source modules 31, 33 or 32, 33 overlap, or the target points The spacing is no greater than the spacing between the targets within each ray source. In this case, there is no missing projection data, and accordingly, there is no need to use the data compensation function of the image processing module for image reconstruction.

In addition to having the same advantages as the radiation scanning apparatus of the aforementioned embodiments, the radiation scanning apparatus of this embodiment has the following advantages.

The ray source and detector in this embodiment only surround the scanning area on three sides. Compared with the case where the scanning area is surrounded on four sides (either or both of the ray source and the detector), sufficient information can be obtained. Data for image reconstruction can also reduce equipment cost and equipment weight, thereby providing lightweight ray scanning equipment.

In addition, in this embodiment, the radiation source module on one side of the scanning area is directly facing the detector crystal of the detector, so that the radiation of the radiation source module can cover more detector units, which is beneficial to increase the amount of data. Improve image quality.

The above describes a ray scanning device in which the ray source surrounds the scanning area on four sides, up, down, left, and right, or on any three sides. According to other embodiments, the ray source may also be arranged to surround the scanning area only on any two sides of the four sides, up, down, left, and right. .

The installation and positioning structures for each ray source module of the ray source are described above. The above installation and positioning structures are not limited to use in the ray scanning device of the present application, and can also be used in other suitable ray scanning devices.

Various installation and fixing structures for the detector group are described above. The above installation and fixing structures are not limited to use in the radiation scanning equipment of the present application, but can also be used in other suitable radiation scanning equipment. The installation and fixing structures of the various embodiments Can be used alone or in combination in a single ray scanning device.

The foregoing description of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or to limit the application to the precise form described. Numerous modifications or variations are possible without departing from the inventive principles of the present application. The embodiments have been described in order to best explain the principles of the application and its practical application. The above description will enable others skilled in the art to better utilize and practice the various embodiments and various modifications of the present application. The scope of the application is defined by the appended claims.

Claims (24)

1. A radiation scanning apparatus, comprising:

a conveying device for conveying the detected object through the scanning area of the ray scanning equipment;

a radiation source including a plurality of radiation source modules, each radiation source module including at least one radiation source point emitting a radiation beam and being arranged around the scanning area in a non-closed configuration opened at one side of the scanning area, viewed in a conveying direction of the inspected object; and

a detector for detecting radiation transmitted through the inspected object during scanning and including a plurality of detector groups whose ends are connected to each other and arranged around the scanning area in a non-closed configuration opened at one side of the scanning area as viewed in a conveying direction of the inspected object,

wherein the opening of the non-closed structure of the radiation source and the opening of the non-closed structure of the detector are oppositely arranged, an

Wherein the plurality of detector groups of the detector are fixed in the same plane perpendicular to the conveying direction of the detected object, and the plurality of ray source modules of the ray source are arranged in a plurality of different planes perpendicular to the conveying direction of the detected object.

2. The radiation scanning apparatus according to claim 1,

the ray source module of the ray source, which is positioned on one side of the opening of the non-closed structure of the detector, and the plurality of detector groups of the detector are fixed in the same plane which is vertical to the conveying direction of the detected object, and other ray source modules of the ray source are fixed in other planes which are vertical to the conveying direction of the detected object.

3. The radiation scanning apparatus according to claim 2,

and other radiation source modules of the radiation source are fixed in other same planes which are vertical to the conveying direction of the detected object.

4. A radiation scanning apparatus according to claim 3,

the plurality of radiation source modules are detachable and mountable independently of each other.

5. The radiation scanning apparatus according to any one of claims 1-4,

each of the plurality of radiation source modules is a distributed multi-point source, and a plurality of distributed multi-point sources are respectively arranged on three sides of the scanning area when viewed in the conveying direction of the detected object so as to form a non-closed structure surrounding one side opening of the scanning area.

6. The radiation scanning apparatus according to claim 5,

the distributed multi-point source is in a straight line shape, an arc shape, a broken line shape or any combination thereof, so that the ray source is in a right-angle rectangular, a rounded rectangle, a polygonal or an elliptical structure which is opened at one side of the scanning area when viewed from the conveying direction of the detected object.

7. The radiation scanning apparatus according to any one of claims 1-4,

each of the plurality of radiation source modules is a single point source group, and each single point source group at least comprises two single point sources.

8. The radiation scanning apparatus according to any one of claims 1-4,

each radiation source module has a separate cavity for accommodating a respective radiation generating device.

9. A radiation scanning apparatus according to claim 8,

the cavity of each radiation source module comprises a separate vacuum chamber for accommodating a plurality of target points.

10. The radiation scanning apparatus according to claim 9,

the spacing between target points within each source module is less than the spacing between target points at the ends of adjacent source modules.

11. A radiation scanning apparatus according to claim 8,

the independent cavity of each ray source module is provided with an installation positioning structure, and the installation positioning structure is used for installing and positioning the ray source module and is used for rotating the ray source module so as to adjust the beam-outgoing angle of the ray beam.

12. A radiation scanning apparatus according to any one of claims 1-4, 6 and 9-11,

each detector group is a detector array comprising a plurality of detector cells, the detector array comprising a linear detector array, an arcuate detector array, or a combination of both.

13. The radiation scanning apparatus according to claim 12,

each detector group is a linear detector array, the detector comprises three linear detector arrays, and the three linear detector arrays are respectively arranged on three sides of the scanning area to form a rectangular or square structure which is opened at one side of the scanning area.

14. The radiation scanning apparatus according to claim 12,

each detector group is a linear detector array, the detector includes a plurality of first linear detector arrays and a plurality of second linear detector arrays, the second linear detector arrays are shorter than the first linear detector arrays, and the plurality of first linear detector arrays and the plurality of second linear detector arrays are alternately arranged around the scanning region to form a polygonal structure opening at one side of the scanning region.

15. The radiation scanning apparatus according to claim 12,

the individual detector groups of the detector are detachable and installable independently of each other.

16. The radiation scanning apparatus according to claim 15,

the detector group of the detector is configured to move perpendicular or parallel to the conveying direction of the detected object for disassembly and assembly.

17. The radiation scanning apparatus according to claim 16,

each detector group of the detectors includes a detector arm, the radiation scanning apparatus includes a support frame fixed relative to a mounting platform of the radiation scanning apparatus, and the detector groups are mounted to or dismounted from the support frame via the detector arms.

18. The radiation scanning apparatus according to any one of claims 1-4, 6, 9-11 and 13-17,

the detector is arranged between the ray source and the scanning area when viewed from the conveying direction of the detected object; and is provided with

And along the conveying direction of the detected object, the other ray source modules are at least partially overlapped with the detector group on the same side.

19. The radiation scanning apparatus according to claim 18,

the detector group of the detector on the same side with the other ray source modules is constructed to avoid the ray beams of the ray source modules on the same side and receive the rays of all the other ray source modules except the ray source modules on the same side.

20. A radiation scanning apparatus according to claim 18,

each detector unit of the detector group comprises a detector crystal for receiving radiation transmitted through the inspected object during scanning, and the detector crystal is arranged at an end of the detector unit in a conveying direction of the inspected object, an

The detector crystals of the detector group of the detector on the same side of the other ray source modules are arranged to be close to the edge of the ray beam of the ray source module on the same side in the conveying direction of the detected object, but not block the ray beam.

21. A radiation scanning apparatus according to claim 20,

the other radiation source modules of the radiation source are arranged such that the radiation beam avoids the detector group on the same side and irradiates the detector crystals of the detector group on the opposite side.

22. A radiation scanning apparatus according to claim 21,

the other source modules are configured to rotate about the target axis such that a central location of the beam of radiation illuminates detector crystals of the detector set on an opposite side.

23. A radiation scanning apparatus according to any of claims 1-4, 6, 9-11, 13-17 and 19-22, further comprising an image processing module configured to perform data compensation and/or reconstruction image inpainting for missing projection data at the ends of the radiation source module to obtain a complete reconstructed image.

24. The radiation scanning apparatus according to claim 23,

the image processing module is configured to perform image reconstruction by an iterative method, an image threshold restoration method, or a combination of both.

Images